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l46kok
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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?