1.

The value of ""^(2)P_(1) + ^(3)P_(1) + ...... + ^(n)P_(1) equal to

Answer»

`(N^(2) - n + 2)/2`
`(n^(2) + n + 2)/2`
`(n^(2) + n - 2)/2`
`(n^(2) - n - 2)/2`

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