Binomial Theorem · JEE Main previous year questions

2016 1 question

1. Q202016 · 3 Apr 2016 · Shift 1

   If the number of terms in the expansion of ${\left(1-\frac{2}{x}+\frac{4}{x^2}\right)}^n$, $x\ne 0$, is 28, then the sum of the coefficients of all the terms in this expansion, is :

   1. A.$243$
   2. B.$729$
   3. C.$64$
   4. D.$2187$
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   Answer: B