If the coefficients of `x^2a n d\ x^3` in the expansion of `(3+a x)^9` are the same, then the value of `a` is a. `-7/9` b. `-9/7` c. `7/9` d. `9/7`

If the coefficients of x^2a n d\ x^3 in the expansion o (3+a x)^9 are the same, then the value of a is -7/9 b. -9/7 c. 7/9 d. 9/7

If the coefficients of x^2a n d\ x^3 in the expansion o (3+a x)^9 are the same, then the value of a is -7/9 b. -9/7 c. 7/9 d. 9/7

If the cofficients of x^(2) and x^(3) in the expansion 0(3+ax)^(9) are the same,then the value of a is -(7)/(9) b.-(9)/(7) c.(7)/(9) d.(9)/(7)

If the coefficents of x^(2) and x^(3) in the expansion of (3+px)^(9) are the same then prove that p= 9/7 .

The coefficient of x^(7) in the expansion of (1+x)^(9) is

" 9.The coefficient of "x^(7)" in the expansion of "(1-x^(4))(1+x)^(9)" is "

If the sum of coefficients of all even powers in the expansion of (1 + x + x^(2) + ….x^(2n))^(2) is 221. Then the value of n is A. 7 B. 10 C. 11 D. 9

The coefficients of x^7 in the expansion of (1-x^4)(1+x)^9 is (A) 27 (B) -24 (C) 48 (D) -48

If x in R then the value of -7x^2 +9x-9 is