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Quantitative Aptitude

Sum of Consecutive Numbers

The sum of th...

Question

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

A

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B

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C

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D

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E

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Solution

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

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