The sum of coefficients of integral powers of x in the binomial expansion of (1−2x)50 is:
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If the coefficient of 4th term in the expansion of (a+b)n is 56, then n is
Find the sum C0+3C1+32C2++3nCn˙
Find the numerically greatest term in the expansion of (3−5x)15whenx=1/5.
Prove that 10C1(x−1)2−10C2(x−2)2+10C3(x−3)2±10C10(x−10)2=x2
if the 7th and 18th terms of the expansion (2+a)50
Find the sum of the series 15C0+15C1+15C2++15C7˙
If (1+x+x2)n=a0+a1x+a2x2++a2nx2n, find the value of a0+a3+a6++,n∈N˙
Find the coefficient of x13
in the expansion of (1−x)5×(1+x+x2+x2)4˙