How To Find Coefficient Of X2 In Binomial Expansion. It is the 5th coefficient. ( 1 + x + x 2) 20 = ∑ n = 0 20 ( 20 n) x 2 n ( 1 + x) 20 − n.

80 binomial coefficient are may be found by applyıng the pascal's rule. Win over the concepts of binomial theorem and get a step ahead with the preparations for mathematics with testbook. Coefficient of x 2 = 6 ( 6 − 1) 2!