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Let (1 + x)^(n) = 1 + a(1)x + a(2)x^(2) ...

Let `(1 + x)^(n) = 1 + a_(1)x + a_(2)x^(2) + ... + a_(n)x^(n)`. If `a_(1),a_(2)` and `a_(3)` are in A.P., then the value of `n` is

A

4

B

5

C

6

D

7

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The correct Answer is:
D
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