|Suppose we have to find the (r+1)th term in the expansion of (x+y)n|
In its expansion we find that
T3 = nC2 xn-2y2
T4 = nC3 xn-3y3
We can see that all these terms have the following properties.
Tr+1 = nCrxn-ryr
Example: Find the tenth term in the expansion of (2x-y)11.
Directions: Answer the following.