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If the coefficients of three consecutive...

If the coefficients of three consecutive terms in the expansion of `(1+x)^n` are in the ratio 1:7:42, then find the value of `ndot`

A

49

B

50

C

55

D

56

Text Solution

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The correct Answer is:
C
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Knowledge Check

  • If the coefficient of three consecutive terms in the expansion of (1+ a)^(n) are in the ratio 1:7:42 , then the value of n is

    A
    51
    B
    53
    C
    55
    D
    57

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