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If the coefficients of (2r +1) ""^(th...

If the coefficients of (2r +1) `""^(th)`term and `(r+1 )^(th)` term in the expansion of `(1 + x) ^(42)` are equal then r can be

A

12

B

14

C

16

D

20

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The correct Answer is:
B
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