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If the number of terms in the expansion of (1 - 2/x + 4/x^2)^n, x ≠ 0, is 28,

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If the number of terms in the expansion of (1 - 2/x + 4/x2)n, x ≠ 0, is 28, then the sum of the coefficients of all the terms in this expansion, is

(a) 64 

(b) 2187 

(c) 243 

(d) 729

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1 Answer

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Best answer

Correct option (d) 729

Explanation:

Clearly, number of terms in the expansion of 

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