If the number of terms in the expansion of
Question:

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

  1. 729 

  2. 64

  3. 2187

  4. 243


Correct Option: 1

Solution:

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