Sum of coefficient in the expansion o f(...

Sum of coefficient in the expansion o f`(1+ax-2x^(2))^(n)` is

A

a) Negative when `a lt 1 and n=2k, ik in N`

B

b) Positive when `a lt 1 and n=2k +1, k in N`

C

c) Positive when `a gt 1 and n in N`

D

d) None of these

Verified by Experts

The correct Answer is:

C

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