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Sheldon Ross 8th edition. Chapter 1.

in Combinatory by (14 points) | 21 views
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please try some examples like C(5,3), C(6,4) and try which is given as hint and then check whether identity holds or not, Then you might get what is happening here and why this identity is true.

Please try it. In case, if you are unable to get it, I will explain.
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@ankitgupta

got it.Thanks.  and should I do all problems from this book? Many problems are really hard.
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@RasMalai According to  me, if you have time, you should try those questions because it is always good to try as much as questions possible otherwise just do theory and examples. After covering all the subjects and previous year questions, if you have time, you can look at those problems. If problem is hard, There is high chance that you get solution on math.stackexchange or on other sites and if it is not available then you can ask it on math.stackexchange. If solution manual is available for the book then you can also look at it for those hard problems.

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okay. thanks.

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