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If nge3and1,alpha(1),alpha(2),alpha(3),....

If `nge3and1,alpha_(1),alpha_(2),alpha_(3),...,alpha_(n-1)` are
the n,nth roots of unity, then find value of`underset("1"le"i" lt "j" le "n" - "1" )(sum""sum) alpha _ "i" alpha _ "j" `

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