Q. The sum of the coefficient in the expansion of ${(1 + x - 3x}^{2})^{3148}\$is
A) 8
B) 7
C) 1
D) $- 1$
Explanation
(c)
On substituting $x = 1$ in $(1 + x - 3x^{2})^{3148},$ then sum of coefficient
$= {(1 + 1 - 3)}^{3148} = {( - 1)}^{3148} = 1$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.