Find the coefficient of `x^5""in(x+3)^8`

Find the coefficient of x^5 in (x+3)^6

Find the coefficient of x^(5) in (1+2x+3x^(2).........

Find the coefficient of x^-1 in (1+3 x^2+x^4) (1+1/x)^8

Find the coefficient of x^-1 in (1+3x^2+x^4)(1+ 1/x)^8

Find the coefficient of (i) x^(5)" in the expansion of "(x+3)^(8) (ii) x^(6) " in the expansion of "(3x^(2) - a/(3x))^(9) (iii) x^(-15) " in the expansion of " (3x^(2) - a/(3x^(3)))^(10). (iv) a^(7)b^(5)" in the expansion of "(a-2b)^(12) .

Find the coefficient of x^(9) in (1+3x+3x^(2)+x^(3))^(15)

Find the coefficient of x^(6) in (1+3x+3x^(2)+x^(3))^(15)

Find the coefficient of x^(-5) in the expansion of (2x^(2)-(1)/(5x))^(8)