# A quick question on Summations.

I can never remember how to expand a summation in to form: $$\sum$$nk=1(22). Thats just a recent example. I can't remember the expansion form any sort of summation really except when it has a defined upper bound.

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Dick
Homework Helper
The upper bound is n and the lower bound is 1 isn't it? Looks to me like 4*n.

sorry i meant to say 2^n for the eq.

Dick