The sum of the all the products of the first n positive integers taken two at a

Question

The sum of the all the products of the first n positive integers taken two at a time is?

Options:

Answer: Option A
:
C
Option (c)Shortcut: Assumption∑xy when n=2 is 1.2Sum= 2Substitute n=2 in answer options and see where 2 is obtained. Option c

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