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1962 AHSME Problems/Problem 12

Revision as of 22:53, 10 November 2013 by Fadebekun (talk | contribs) (→‎Solution)

Problem

When $\left ( 1 - \frac{1}{a} \right ) ^6$ is expanded the sum of the last three coefficients is:

$\textbf{(A)}\ 22\qquad\textbf{(B)}\ 11\qquad\textbf{(C)}\ 10\qquad\textbf{(D)}\ -10\qquad\textbf{(E)}\ -11$

Solution

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