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The sum of the products of the ten numbe...

The sum of the products of the ten numbers `pm1,pm2,pm3,pm4,pm5` takung two at a time, is

A

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

B

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

C

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

D

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