Awesome q2a theme
0 votes
A box contains 5 red marbles, 8 green marbles, 11 blue marbles, and 15 yellow marbles. We draw marbles uniformly at random without replacement from the box. What is the minimum number of marbles to be drawn to ensure that out of the marbles drawn, at least 7 are of the same colour?

(A) 7

(B) 8

(C) 23

(D) 24

(E) 39
in Combinatory by (3.6k points) | 10 views

1 Answer

0 votes
In the worst case we’ll choose $5$ red marbles, $6$ green marbles, $6$ blue marbles and $6$ yellow marbles, before choosing the marble that’ll be the seventh marble of the same color (either green, blue or yellow).

So $5 + 6 + 6 + 6 + 1 = 24$ marbles.
by (3.6k points)
Quick search syntax
tags tag:apple
author user:martin
title title:apple
content content:apple
exclude -tag:apple
force match +apple
views views:100
score score:10
answers answers:2
is accepted isaccepted:true
is closed isclosed:true
Welcome to GATE CSE Doubts, where you can ask questions and receive answers from other members of the community.
9,200 questions
3,182 answers
96,168 users