Permutations And Combinations

Question
CBSEENMA11014088

Evalaute:

fraction numerator straight n factorial over denominator straight r factorial space left parenthesis straight n minus straight r right parenthesis factorial end fraction comma when

n = 9,  r = 1

Solution

Solution not provided.
Ans.  9

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Some More Questions From Permutations and Combinations Chapter

Determine K, so that K + 2, 4K – 6 and 3K – 2 are three consecutive terms of an A.P.