Permutations And Combinations Question 86

Question: $ ^{n}C _{r}{{\div }^{n}}{C _{r-1}}= $ [MP PET 1984]

Options:

A) $ \frac{n-r}{r} $

B) $ \frac{n+r-1}{r} $

C) $ \frac{n-r+1}{r} $

D) $ \frac{n-r-1}{r} $

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Answer:

Correct Answer: C

Solution:

  • On simplifying you will get $ \frac{n-r+1}{r} $ .