I'm guessing you're asking about this:
We need two things from you: the entire problem, including instructions; and something from you to show how you are thinking, or at least what you have learned that you could use (e.g. formulas for particular sums).
But I would probably start by expanding the term. I suspect you would then see that you have a formula for each part of it.
I also see that you broke a rule by submitting this twice, rather than waiting patiently for moderation.
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