" The coefficient of "a^(8)b^(4)c^(9)d^(9)" in "(abc+abd+acd+bcd)^(10)" is "

The coefficient of a^8b^4c^9d^9 in (a b c+a b d+a c d +b c d)^(10) is

The coefficient of a^8b^4c^9d^9 in (a b c+a b d+a c d d+b c d)^(10) is 10 ! b. (10 !)/(8!4!9!9!) c. 2520 d. none of these

The coefficient of a^8b^4c^9d^9 in (a b c+a b d+a c d+b c d)^(10) is 10 ! b. (10 !)/(8!4!9!9!) c. 2520 d. none of these

The coefficient of a^8b^4c^9d^9 in (a b c+a b d+a c d+b c d)^(10) is 10 ! b. (10 !)/(8!4!9!9!) c. 2520 d. none of these

Find the coefficient of a^(5) b^(5)c^(5)d^(6) in the expansion of the following expression. (bcd + acd + abd+ abc)^(7)

The coefficient of (x^(3)* b^(6) * C^(8) *d^(9) *e *f) in the expansion of (a + b + c - d - e - f)^(31) is

The coefficient of (x^(3)* b^(6) * C^(8) *d^(9) *e *f) in the expansion of (a + b + c - d - e - f)^(31) is

The coefficient of (x^(3)* b^(6) * C^(8) *d^(9) *e *f) in the expansion of (a + b + c - d - e - f)^(31) is

Find the coefficient of x^2 y^3 z^4 in the expansion of (ax -by +cx)^9 (b) a^2 b^3 c^4 d in the expansion of (a -b-c +d)^10