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

If `underset( i = 1) overset( 2n) Sigma cos^(-1) x_(i) = 0`,then find the value of `underset(i = 1) overset(2n) Sigma x_(i)`

A

n

B

2n

C

`(n(n+1))/(2) `

D

None of these

Text Solution

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The correct Answer is:
B
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