Question

(x + 2) is raised to the fifth power. The third term of the expansion is:

A. C(5, 3)x³2²
B. C(5, 3)x²2³
C. C(5, 2)x³2²,

Answer 1

Ans. C In binomial expansion of (a +b)^n: Tr = (r+1)'th term = C(n, r). a^(n-r) . b^r Here, n = 5 and r = 2 So, here T3 = C(5, 2) x^3 . 2^2