The coefficient of `x^(6) y^(6) z^(4)` in the expansion of
`(x + y + z)^(18)`, is not equal to

The coefficient of x^(8) y^(6) z^(4) in the expansion of (x + y + z)^(18) , is not equal to

The coefficient of x^(2)y^(4)z^(2) in the expansion of (2x-3y+4z)^(9) is

The coefficient of x^(2)y^(5)z^(3) in the expansion of (2x+y+3z)^(10) is

Find the coefficient of x^3y^4z^5 in the expansion of (xy+yz+zx)^6

(i) Find the coefficient of x^(3)y^(4)z^(2)t^(5) in the expansion of (x-y+z-t)^(14) . (ii) Find the coefficient of x^(10)y^(12)z^(8) in the expansion of (xy+yz+zx)^(15)

The coefficients of x^(2)y^(2),yzt^(2) and xyzt in the expansion of (x+y+z+t)^(4) are in the ratio

The coefficient of y^(7) in the expansion of (y+z)^(7) is ____________