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Question

Question: The sum of last eight coefficient in expansion (1 + x)<sup>15</sup> is...

The sum of last eight coefficient in expansion (1 + x)15 is

A

216

B

215

C

214

D

None

Answer

214

Explanation

Solution

S = 15C15 + 15C14 ….+ 15C9 + 15C8

\ S = 15C0 + 15C1 ……+15C6 + 15C7 2S = 215

Ž S = 214