Permutations and Combinations Questions

1:

Given npr = 3024

Value of r will be

A.

3

B.

4

C.

6

D.

9

 

Answer : B

Explanation :

Since npr is product of consecutive positive integers.

npr = 3024 = 9 x 8 x 7 x 6

Hence,        r = 4

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Option: A

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