Expansion of a Binomial
Source:
March 3, 2010
algebrabinomial theorem
Problem Statement
When \left ( 1 \minus{} \frac{1}{a} \right ) ^6 is expanded the sum of the last three coefficients is:
(A)\ 22 \qquad
(B)\ 11 \qquad
(C)\ 10 \qquad
(D)\ \minus{}10 \qquad
(E)\ \minus{}11