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Find the sum of all possible products of...

Find the sum of all possible products of the first `n` natural numbers taken two by two.

A

`(1)/(24)n(n+1)(n-1)(3n+2)`

B

`(n(n+1)(2n+1))/(6)`

C

`(n(n-1)(2n-1)(n+3))/(24)`

D

None of these

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The correct Answer is:
A
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