Find the 4th term in the expansion of (x – 2y)12.
The general term Tr+1 in the binomial expansion is given by Tr+1 = nCr an-r br
Here a= x , n =12 , r= 3 and b = -2y
T4 = 12C3 x9 (-2y)3
= 
= 
= -1760 x9 y3
7
Find the 4th term in the expansion of (x – 2y)12.
The general term Tr+1 in the binomial expansion is given by Tr+1 = nCr an-r br
Here a= x , n =12 , r= 3 and b = -2y
T4 = 12C3 x9 (-2y)3
=
=
= -1760 x9 y3