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If the coefficient of rth term and (r+1)...

If the coefficient of `rth` term and `(r+1)^(th)` term in the expansion of `(1+x)^(20)` are in ratio `1:2`, then `r` is equal to

A

6

B

7

C

8

D

9

Text Solution

Verified by Experts

The correct Answer is:
B
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