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AoPS Wiki:Problem of the Day/July 8, 2011

< AoPS Wiki:Problem of the Day
Revision as of 20:06, 7 July 2011 by Btilm305 (talk | contribs) (Protected "AoPSWiki:Problem of the Day/July 8, 2011": Problem of the Day ([edit=sysop] (indefinite) [move=sysop] (indefinite)))
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What is the coefficient of $a^{-1/2}$ in the expansion of $\left(a-\frac{1}{\sqrt{a}}\right)^7$?

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