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If the coefficients of r^(th) and (r+1)...

If the coefficients of `r^(th)` and `(r+1)^(th)` terms in the expansion of `(3+7 x)^(29)` are equal, the `r `is equal to

A

1: 15

B

2: 21

C

3: 24

D

4: 14

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The correct Answer is:
B
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