If the three consecutive coefficients in the expansion of `(1+x)^n` are 28, 56, and 70, then the value of `n` is.

If the coefficient of 4th term in the expansion of (a+b)^n is 56, then n is

If a,b,c,d be four consecutive coefficients in the binomial expansion of (1+x)^(n) , then value of the expression (((b)/(b+c))^(2)-(ac)/((a+b)(c+d))) (where x gt 0 and n in N ) is

Find the sum of the coefficients in the expansion of (1+2x+3x^2+ n x^n)^2dot

If the middle term in the expansion of (x^2+1//x)^n is 924 x^6, then find the value of ndot

If the sum of the coefficients in the expansion of (a + b)^(n) is 4096, then the greatest coefficient in the expansion is

If the binomial coefficients of three consecutive terms in the expansion of (a+x)^n are in the ratio 1:7 :42 , then find n .

If the sum of the coefficients in the expansion of (1 -3x + 10x^2)^(n) is a and the sum of the coefficients in the expansion of (1 - x^(2))^(n) is b , then