breathmath.com
Binomial Theorem – Exercise 8.2 – Class XI
Find the coefficient of x5 in (x + 3)8 Solution: It is known that (r + 1)th term, (Tr+1), in the binomial expansion of (a + b)n is given by Tr+1 = nCr an-r br Assuming that x5 occurs in the (r + 1)…