Find the sum of the series 1*2*3+2*3*4+3...

Find the sum of the series `123+234+345+"...." " upto n terms "` .

A

`n(n+1)(n+2)`

B

`(n+1)(n+2)(n+3)`

C

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

D

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

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The correct Answer is:

A

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