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#1
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Seriessum is not quite it...need help, please
I am trying to find a formula that will take a sum of a series of powers
without having to use a load of IF statements. Here is what I need: User inputs a positive number, y and excel a constant number, x, to calulate the following: X+X^2+X^3+X^4+....+X^Y. It appears that series sum is not capable of doing this, as it adds another factor to the equation, multiplying a times X, with a changing for each term. Anyone have any ideas? Thanks. |
#2
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use
=SUMPRODUCT(A2^ROW(INDIRECT("1"&":"&B2))) where cell A2 = X and cell B2 = Y "lizard2806" wrote in message ... I am trying to find a formula that will take a sum of a series of powers without having to use a load of IF statements. Here is what I need: User inputs a positive number, y and excel a constant number, x, to calulate the following: X+X^2+X^3+X^4+....+X^Y. It appears that series sum is not capable of doing this, as it adds another factor to the equation, multiplying a times X, with a changing for each term. Anyone have any ideas? Thanks. |
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