The coefficient fo `x^2` in `7pqrx^2` is​

If the coefficient of x^7 in (x^2+1/(bx))^11 is equal to coefficient at x^-7 in (x+1/(bx^2))^11 Then find value of b

The coefficient of xy in 3x^2 zy + 7 xyz - 2z^2x is

The coefficient of x^(7) in (1+2x+3x^(2)+..oo)^-5

(2+x/3)^n if the coefficient of x^7 and x^8 is same then find value of n

Write the coefficient of x in P(x)= 7x^2-3x+4