Binomial Theorem.

• May 12th 2010, 11:07 AM
acc
Binomial Theorem.
If the numerical coefficients are disregarded, the following terms appear in the expansion of (x + y)11

State the value of k in each case:

a) x2 yk

b) xk y11
• May 12th 2010, 08:42 PM
mr fantastic
Quote:

Originally Posted by acc
If the numerical coefficients are disregarded, the following terms appear in the expansion of (x + y)11

State the value of k in each case:

a) x2 yk

b) xk y11

The general term is ${11 \choose r} x^{11 - r} y^r$.

a) If 11 - r = 2 then r = .... Therefore k = ....

b) If r = 11 then k = ....