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Use inputdlg() to get n - look in the help for examples. Then use a for loop. Here's a hint to get you started.
theSum = 0; for k = 1 : n % your code goes here. theSum = theSum + ........ end
I don't know what you mean by exp. Do you want e to the power? Like exp(1) + exp(2) + exp(3) + .... OR do you want exp(1+2+3+.....????