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If the sum of the coefficients in the expansion of  (x-2 y+3 z)^n  is 128 then the greatest coefficient in the expansion of  (1+x)^nis

 

Option: 1

35


Option: 2

20


Option: 3

10


Option: 4

None of these 


Answers (1)

best_answer

Sum of the coefficient in the expansion

(x-2 y+3 z)^n \text { is }(1-2+3)^n=2^n

\therefore 2^n=128 \Rightarrow n=7

Therefore, greatest coefficient in the expansion of (1+x)^7 is { }^7 C_3 or { }^7 C_4 because both are equal to 35.

 

Posted by

jitender.kumar

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