Offline paper
Mathematics · 2016
JEE Main 2016 · 2016-04-03 Offline · Q67
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:
If the number of terms in the expansion of $\displaystyle \left(1-\frac{2}{x}+\frac{4}{x^2}\right)^n, x \neq 0$, is $\displaystyle 28$, then the sum of the coefficients of all the terms in this expansion, is :
Official answer
(4)
$\displaystyle 729$
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JEE Main 2016 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.