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If the coefficients of the three success...

If the coefficients of the three successive terms in the binomial expansion of `(1+x)^n` are in the ratio `1:7:42` then the first of these terms in the expansion is

A

`6^(th)`

B

`7^(th)`

C

`8^(th)`

D

`9^(th)`

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Verified by Experts

The correct Answer is:
B
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