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Recent questions and answers in Combinatory
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there are 5 pairs of different shoes.in how many ways can each person so that at least two person get a complete pair
asked
Oct 20
in
Combinatory
by
ajay05908
(
5
points)

10
views
combinatory
0
votes
1
answer
Rosen  combinatorics ex 5.5 que 4
Every day a student randomly chooses a sandwich for lunch from a pile of wrapped sandwiches. If there are six kinds of sandwiches how many diff ways are there for the student to choose sandwiches for the 7 days of a week if the order in which sandwiches are chosen matters
answered
Oct 17
in
Combinatory
by
mayureshpatle
(
855
points)

23
views
combinatory
0
votes
1
answer
Made easy  Discrete mathematics
How many ways can 10 balls be chosen from a container having 10 identical green balls , 5 identical yellow balls and 3 identical blue balls
answered
Oct 17
in
Combinatory
by
mayureshpatle
(
855
points)

62
views
discretemaths
combinatory
0
votes
2
answers
KENNETH ROSEN DISCRETE MATHEMATICS PAGE 432 Q11
How many ways are there to chose eight coins from piggy bank containing 100 identical pennies and 80 identical nickels.
answered
Oct 9
in
Combinatory
by
Nikhil_dhama
(
151
points)

50
views
kennethrosen
combinatory
counting
discretemaths
0
votes
1
answer
Applied scholarship test
The number of straight lines that can be drawn through 90 points.Given that 10 of them lie on a straight line.
answered
Sep 28
in
Combinatory
by
himanshu2021
(
127
points)

33
views
0
votes
1
answer
Applied Scholarship Test
A)1/16 B)1/15 C)1/4 D)NONE
answered
Sep 28
in
Combinatory
by
himanshu2021
(
127
points)

27
views
0
votes
1
answer
Test Question of Applied Gate
Not able to solve this question. How to solve this type of questions?
answered
Sep 16
in
Combinatory
by
Ehraz Hasan
(
366
points)

28
views
combinatory
0
votes
3
answers
RosenChapter 8, Ex 8.5,Question 24
Find the probability that when a fair coin is flipped five times tails comes up exactly three times, the first and last flips come up tails, or the second and fourth flips come up heads.
answered
Sep 16
in
Combinatory
by
Shashank Rustagi
(
513
points)

98
views
kennethrosen
discretemathematics
0
votes
0
answers
Self doubt on Permutations and combination
If no three diagonals of a convex decagon meet at the same point inside the decagon, into how many line segments are the diagonals divided by their intersection?
asked
Sep 9
in
Combinatory
by
Shashank Rustagi
(
513
points)

18
views
0
votes
0
answers
self doubt o this question
How can you get like for 2 I’s (3!*4)/2! ?? I know i am asking such a basic question but i’m little bit confused that’s why i asking.
asked
Sep 4
in
Combinatory
by
AbhayPrajapati
(
7
points)

17
views
0
votes
0
answers
Self Doubt on Combinatorics
Why these 2 questions solved in different manner while it seems like both are same type questions?? Anyone Please.
asked
Sep 4
in
Combinatory
by
AbhayPrajapati
(
7
points)

22
views
combinatory
selfdoubt
maths
combinatory
0
votes
1
answer
Self Doubt on Combinatorics
Is there any difference between these 2 questions?? If yes then how can we solve this???
answered
Sep 3
in
Combinatory
by
Shashank Rustagi
(
513
points)

49
views
maths
selfdoubt
combinatory
0
votes
2
answers
Allan Career Institute: Discrete Math
Let $f\left ( x\right )$ be continuous probability density function of a random variable $X.$ Then probability of $a\leq X< b$ is $A)f\left ( b \right )f\left ( a \right )$ $B)f\left ( ab \right )$ $C)\int_{b}^{a}xf\left ( x \right )dx$ $D)\int_{b}^{a}f\left ( x \right )dx$ Plz give some link for probability of pdf
answered
Aug 16
in
Combinatory
by
jayeshasawa001
(
2.5k
points)

51
views
discretemaths
0
votes
1
answer
Self Doubt recurrence equation
answered
Aug 16
in
Combinatory
by
Arkaprava
(
711
points)

25
views
discretemaths
combinatory
+1
vote
1
answer
Kenneth Rosen(7th ed). Chapter 6. Example 16.
Each user on a computer system has a password, which is six to eight characters long, where each character is an uppercase letter or a digit. Each password must contain at least one digit. How many possible passwords are there? Answer is given in book as : P^6 + P ... on for P^7 and P8. My question is why can't we calculate P^6 like 36^5 * C(6,1) * 10 ?
answered
Aug 15
in
Combinatory
by
Arkaprava
(
711
points)

20
views
combinatory
counting
kennethrosen
0
votes
3
answers
Self Doubt. Combination, Circular. A, B, C, D, E, f are on circlular table.
answered
Aug 14
in
Combinatory
by
jayeshasawa001
(
2.5k
points)

48
views
combinatory
selfdoubt
0
votes
2
answers
SelfDoubt 10 couple, { 10 men and 10 women }, Number of Ways
answered
Aug 14
in
Combinatory
by
jayeshasawa001
(
2.5k
points)

49
views
selfdoubt
discretemaths
permutation&combination
+1
vote
1
answer
K Rosen(7th ed). Chapter 6. Exercise 6.4. Q.17.
Question: Answer 1: Answer 2: I am not able to understand the solution.What’s happening here? Please help.
answered
Aug 13
in
Combinatory
by
Arkaprava
(
711
points)

27
views
kennethrosen
combinatory
counting
discretemaths
+1
vote
1
answer
nptel assignment
I am getting answer 64 didn’t know how answer is 40
answered
Aug 12
in
Combinatory
by
Arkaprava
(
711
points)

75
views
0
votes
1
answer
#discrete mathematics #exponential generating function
answered
Aug 12
in
Combinatory
by
Arkaprava
(
711
points)

14
views
discretemaths
kennethrosen
0
votes
1
answer
jee practice ques permutation
There are 5 apples 10 mangoes and 15 oranges in a basket. Then find number of ways of distributing 15 fruits each to 2 persons. a)56 b)64 c)66 d)72
answered
Aug 11
in
Combinatory
by
Arkaprava
(
711
points)

31
views
combinatory
0
votes
1
answer
Made easy topic wise tests
please explain this briefly!! .
answered
Aug 11
in
Combinatory
by
jayeshasawa001
(
2.5k
points)

29
views
+1
vote
1
answer
Explain this briefly
2^n 2^n1 (2^n1)1 n^2
answered
Aug 10
in
Combinatory
by
jayeshasawa001
(
2.5k
points)

47
views
0
votes
0
answers
Recurrence relation  ROSEN
$1.\ a_{k}=3a_{k1}+4^{k1} a_{0}=1$ $2.\ a_{k}=4a_{k1}4_{k2}+k^2 a_{0}=2,a_{1}=5$
asked
Aug 6
in
Combinatory
by
KUSHAGRA गुप्ता
(
1.4k
points)

56
views
recurrencerelations
kennethrosen
discretemathematics
0
votes
0
answers
Self doubt on combinatorics
How many strings are there, using 10 A's, 12 B's, 11 C's, and 15 D's, such that no A is followed by a B, and no C is followed by a D?
asked
Jul 29
in
Combinatory
by
RasMalai
(
27
points)

13
views
combinatory
permutation&combination
combinatory
0
votes
0
answers
Sheldon Ross (8th ed). Chapter 1. Self test problems. Q 4.
asked
Jul 29
in
Combinatory
by
RasMalai
(
27
points)

24
views
combinatory
0
votes
0
answers
Sheldon Ross(8th ed). Chapter 1. Theoretical Excercises. Q 11.
asked
Jul 27
in
Combinatory
by
RasMalai
(
27
points)

29
views
combinatory
0
votes
1
answer
self doubt permutation and combination
answered
Jun 1
in
Combinatory
by
vps123
(
5
points)

18
views
discretemaths
combinatory
0
votes
1
answer
P&C  self doubt
Find the number of arrangements of the letters of the word "INDEPENDENCE" if they start with "P" and end with "D"
answered
May 29
in
Combinatory
by
Mohit Kumar 6
(
5
points)

23
views
discretemathematics
combinatory
discretemaths
0
votes
0
answers
ISI Tomato Book
The value of $\sum \binom{k}{i} \binom{Mk}{100i} [(ki)/(M100)]/ \binom{M}{100}$, where M – k > 100, k > 100 and $\binom{m}{n}$= m!/{(m – n)!n!} equals (summation running from i = 0 to i = 100) (a) k/M (b) M/k (c)$k/M^{2}$ (d) $M/k^{2}$
asked
May 13
in
Combinatory
by
PSDesai09
(
5
points)

19
views
combinatory
combinatory
discretemaths
0
votes
0
answers
GATE201846 Video Solution
The number of possible minheaps containing each value from $\{1,2,3,4,5,6,7\}$ exactly once is _______
asked
Apr 18
in
Combinatory
by
admin
(
193
points)

13
views
gate2018
combinatory
numericalanswers
videosolution
0
votes
0
answers
GATE2016126 Video Solution
The coefficient of $x^{12}$ in $\left(x^{3}+x^{4}+x^{5}+x^{6}+\dots \right)^{3}$ is ___________.
asked
Apr 18
in
Combinatory
by
admin
(
193
points)

4
views
gate20161
combinatory
generatingfunctions
normal
numericalanswers
videosolution
0
votes
0
answers
GATE2016127 Video Solution
Consider the recurrence relation $a_1 =8 , a_n =6n^2 +2n+a_{n1}$. Let $a_{99}=K\times 10^4$. The value of $K$ is __________.
asked
Apr 18
in
Combinatory
by
admin
(
193
points)

3
views
gate20161
combinatory
recurrence
normal
numericalanswers
videosolution
0
votes
0
answers
GATE20181 Video Solution
Which one of the following is a closed form expression for the generating function of the sequence $\{a_n\}$, where $a_n = 2n +3 \text{ for all } n=0, 1, 2, \dots$? $\frac{3}{(1x)^2}$ $\frac{3x}{(1x)^2}$ $\frac{2x}{(1x)^2}$ $\frac{3x}{(1x)^2}$
asked
Apr 18
in
Combinatory
by
admin
(
193
points)

4
views
gate2018
generatingfunctions
normal
combinatory
videosolution
0
votes
0
answers
GATE2016229 Video Solution
The value of the expression $13^{99}\pmod{17}$ in the range $0$ to $16$, is ________.
asked
Apr 18
in
Combinatory
by
admin
(
193
points)

5
views
gate20162
modulararithmetic
normal
numericalanswers
videosolution
0
votes
0
answers
GATE2017247 Video Solution
If the ordinary generating function of a sequence $\left \{a_n\right \}_{n=0}^\infty$ is $\large \frac{1+z}{(1z)^3}$, then $a_3a_0$ is equal to ___________ .
asked
Apr 18
in
Combinatory
by
admin
(
193
points)

4
views
gate20172
combinatory
generatingfunctions
numericalanswers
normal
videosolution
0
votes
0
answers
GATE201921 Video Solution
The value of $3^{51} \text{ mod } 5$ is _____
asked
Apr 18
in
Combinatory
by
admin
(
193
points)

5
views
gate2019
numericalanswers
combinatory
modulararithmetic
videosolution
0
votes
0
answers
GATE200544 Video Solution
What is the minimum number of ordered pairs of nonnegative numbers that should be chosen to ensure that there are two pairs $(a,b)$ and $(c,d)$ in the chosen set such that, $a \equiv c\mod 3$ and $b \equiv d \mod 5$ $4$ $6$ $16$ $24$
asked
Apr 18
in
Combinatory
by
admin
(
193
points)

5
views
gate2005
settheory&algebra
normal
pigeonholeprinciple
videosolution
0
votes
0
answers
GATE201535 Video Solution
The number of $4$ digit numbers having their digits in nondecreasing order (from left to right) constructed by using the digits belonging to the set $\{1, 2, 3\}$ is ________.
asked
Apr 18
in
Combinatory
by
admin
(
193
points)

4
views
gate20153
combinatory
normal
numericalanswers
videosolution
0
votes
0
answers
GATE200475 Video Solution
Mala has the colouring book in which each English letter is drawn two times. She wants to paint each of these $52$ prints with one of $k$ colours, such that the colour pairs used to colour any two letters are different. Both prints of a letter can also be coloured with the same colour. What is the minimum value of $k$ that satisfies this requirement? $9$ $8$ $7$ $6$
asked
Apr 18
in
Combinatory
by
admin
(
193
points)

3
views
gate2004
combinatory
videosolution
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