If the fifth term of the expansion `(a^(2//3)+a^(-1))^n` does not contain `'a'`. Then `n` is equal to a. `2` b. `5` c. `10` d. none of these

If the fifth term of the expansion (a^(2/3)+a^(-1))^(n) does not contain 'a'. Then n is equal to 2 b.5c.10d .none of these

If the coefficients of 2nd, 3rd and 4th terms in the expansion of (1+x)^n \ , nin NN are in A.P, then n is a. 7 b. 14 c. 2 d. none of these

If the coefficients of the (n+1)^(t h) term and the (n+3)^(t h) term in the expansion of (1+x)^(20) are equal , then the value of n is a. 10 b. 8 c. 9 d. none of these

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 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 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 second term of the expansion [a^(1/(13))+a/(sqrt(a^(-1)))]^n is 14 a^(5//2) , then the value of (^n C_3)/(^n C_2) is.

If the second term of the expansion [a^(1/(13))+a/(sqrt(a^(-1)))]^n is 14 a^(5//2) , then the value of (^n C_3)/(^n C_2) is.

If the second term of the expansion [a^(1/(13))+a/(sqrt(a^(-1)))]^n is 14 a^(5//2) , then the value of (^n C_3)/(^n C_2) is.

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