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the coefficients of x^3 and x^4 in the e...

the coefficients of `x^3` and `x^4` in the expansion of `(1+ax+bx^2)(1-2x)^18`

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If the coefficients of x^3 and x^4 in the expansion of (1+ax+bx^3)(1-2x)^18 in powers of x are both zero, then (a,b) is equal to

If the coefficient of x^(3) and x^(4) in the expansion of (1+ax+bx^(2)) (1-2x)^(18) in power of x are both zero, then (a,b) is equal to

If the coefficents of x^(3) and x^(4) in the expansion of (1+ax + bx^(2)) (1-2x)^(18) in powers of x and both zero then (a,b) is equal to

If the cofficients of x^(3)andx^(4) in the expansion of (1+ax+bx^(2))(1-2x)^(18) in powers pf x are both zero , the (a , b) is equal to -

If the coefficient x^(2) and x^(3) in the expansion of (1 + 8x + bx^(2))(1 - 3x)^(9) in the power of x are equal , then b is :

If the coefficient x^(2) and x^(3) in the expansion of (1 + 8x + bx^(2))(1 - 3x)^(9) in the power of x are equal , then b is :

Find the coefficients of x^4 in the expansion of (1+x+x^2)^3

The coefficient of x^(4) in the expansion of (1 + x + x^(2))^(3) is