How do I solve this? My brain is failing me. Any advice would be great.
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Everything in the summand that does not contain a k can be factored out of the summand. What does that do for you?
So the summation becomes: My brain is still stuck. 40C/104F+ temps are killing me. >_<
maybe you remember this ...
Also,
wonder if the sum is full of typos or if the problem tries to bust you.
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