If the number of terms in the expansion ...

If the number of terms in the expansion of `(1-2/x+4/(x^2))^n , x!=0,` is 28, then the sum of the coefficients of all the terms in this expansion, is :
(1) 64
(2) 2187
(3) 243
(4) 729

A

2187

B

243

C

729

D

64

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The correct Answer is:

C

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