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 :-
Correct Option: 1
Solution:
Click here to get exam-ready with eSaral
For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.