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If underset( i = 1) overset( 2n) Sigma s...

If `underset( i = 1) overset( 2n) Sigma sin^(-1) x_(i) = n pi` , then find the value of `underset( i = 1) overset( 2n) Sigma x_(i)`.

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The correct Answer is:
`n((n+1)/2)`
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