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# How do I evalutate $$\sum_{r=1}^{n} [r(r+1)(r+2)(r+2)]$$?

As clear from the title itself, I need to evaluate:

$$$$\sum_{r=1}^{n} [r(r+1)(r+2)(r+2)]$$$$

But I don't know where to start.

Can someone possibly give a hint??