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## Homework Statement

U( r ) = r(r+1)(r+2)(r+3), show that U (r + 1) - U ( r ) = 4(r+1)(r+2)(r+3) Hence, find the sum to n terms of the series 2x3x4 + 3x4x5 + 4x5x6 +.....

## Homework Equations

Sequence Knowledge..

## The Attempt at a Solution

I can't even TOUCH on the problem. Can you please help?