JEE MATHEMATICS MCQ: PERMUTATIONS

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The number of permutations of

n

different things taken

r

at a time, in which

p(r \leq n-p)

particular things will never occur, is

View answer and explanation

Correct option: A

P(n-p, r)

Option A (P(n-p, r)) is correct because it represents the number of permutations when p particular things are excluded from n different things, and r items are taken at a time.

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How many different nine digit numbers can be formed from the number 223355888 by rearranging its digits so that the odd digits occupy even positions? The number of ways in which

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\left( {m + n} \right)

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