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.

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.

Find the 4^th term in the expansion of (x-2y)^12 .

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

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

If the coefficient of the 2^(nd) , 3^(rd) and 4^(th) terms in the expansion of (1 + x)^(n) are in A.P, then n=

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

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 binomial expansion of (1/x+xsinx)^(10) is equal to (63)/8, find the value of xdot

The first three terms in the expansion of (1+a x)^n(n!=0) are 1,6xa n d16 x^2dot Then find the value of aa n dndot