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1. 2 .3+2. 3 .4++n(n+1)(n+2)=(n(n+1)(n+2...

`1. 2 .3+2. 3 .4++n(n+1)(n+2)=(n(n+1)(n+2)(n+3))/4`

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The correct Answer is:
`(n+7)`
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