Find the 4th term in the expansion of (x – 2y) 12 .

Question

Philoid · Accepted Answer

The general term T_r+1 in the binomial expansion is given by T_r+1 = ⁿC_r a^n-r b^r

Here a= x , n =12 , r= 3 and b = -2y

T₄ = ¹²C₃ x⁹ (-2y)³

=

= -1760 x⁹ y³

Find the 4th term in the expansion of (x – 2y)12.