Let a1 ,..., an e (R) be such that a1+ ... +an=1. Show that a^2 1+... +a^ n = 1/n

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answerhappygod
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Let a1 ,..., an e (R) be such that a1+ ... +an=1. Show that a^2 1+... +a^ n = 1/n

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Let a1 ,..., an e (R) be such that a1+ ... +an=1. Show
that
a^2 1+... +a^ n = 1/n
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