If the constant term in the binomial expansion of `(x^2-1/x)^n ,n in N` is 15, then the value of `n` is equal to.

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

The number of real negative terms in the binomial expansion of (1+i x)^(4n-2),n in N ,x >0 is

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

Find the r^th term from the end in the expansion of (x + a)^n .

If the 2nd, 3rd and 4th terms in the binomial expansion of (x+a)^(n) are 240, 720 and 1080 for a suitable values of x, find x, a and n.

In the binomial expansion of (a - b)^(n) , n gt= 5 , the sum of 5^(th) and 6^(th) term a/b equals

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 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

If the 4th term in the expansion of (a x+1//x)^n is 5/2, then (a) a=1/2 b. n=8 c. a=2/3 d. n=6

The 2^(nd), 3^(rd) and 4^(th) terms in the binomial expansion of (x+a)^(n) are 240, 720 and 1080 for a suitable value of x. Find x, a and n.