Find the coefficient of `a^(3)b^(4)c` in the expansion of `(1+a-b+c)^(9)`.

Find the coefficient of a^(3)b^(4)c^(5) in the expansion of (bc+ca+ab)^(6)

Find the coefficient of a^5b^7 in the expansion of (a-2b)^12

Find the coefficient of x^4 in the expansion of (1-x^2)^n

Find the coefficient of x^9 in the expansion of (3x^2+5/x^3)^12

Find a if the coefficients of x^2 and x^3 in the expansion of (3+ax)^9 are equal

The coefficient of x in the expansion of (1-3x+7x^(2))(1-x)^(16) is a)17 b)19 c) -17 d) -19

The power of x in the term with the greatest coefficient in the expansion of (1+x/(2))^(10) is a)2 b)3 c)4 d)5