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For each positive integer n, let An=max{...

For each positive integer n, let `A_n=max{(C(n,r) 0 le r le n}` then the number of elements n in {1,2...20} for `1.9 le (A_n)/(A_(n-1)) le 2` is

A

9

B

10

C

11

D

12

Text Solution

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The correct Answer is:
C
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