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`

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

Find the 6th term in expansion of (2x^2-1//3x^2)^(10)dot

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 6th term in the expansion of (1/(x^(8/3))+x^2(log)_(10)x)^8 is 5600, then x equals

If the coefficients of 5th, 6th , and 7th terms in the expansion of (1+x)^n are in A.P., then n= a. 7 only b. 14 only c. 7 or 14 d. none of these

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 third term in expansion of (1+x^(log_2x))^5 is 2560 then x is equal to (a) 2sqrt2 (b) 1/8 (c) 1/4 (d) 4sqrt2

The coeffcients of the (r-1)^th , r^th and (r+1)^th terms in the expansion of (x+1)^n are in the ration 1 : 3: 5 Find n and r.

If the number of terms in the expansion of (1-2/x+4/(x^2))^n , x!=0, is 28, then the sum of the coefficients of all the terms in this expansion, is : (1) 64 (2) 2187 (3) 243 (4) 729

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