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I have had trouble trying to express a sigma sum formula.
Please do not think I have been lazy, I have been lazy, it is just I have up attempting to work it out after over 2 hours (when my actual question still remains to be written).
I was intending to specify a sigma with a variable ( n) at the top right of it And a (i=1) on the bottom right of the sigma. I have made many attempts, but I cannot have an "=" expression instead of a simple variable (like i on its own).