I recieved this question and don't really know where to start with it, any help would be much appreciated.. "The formula 1 + r + r^2 +..r(n-1) = 1-n/1-r is true for what values of r?"
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Originally Posted by 14041471 "The formula 1 + r + r^2 +..r(n-1) = 1-n/1-r is true for what values of r?" If I understand your meaning correctly, then look up the rules they gave you for the sums of infinite geometric progressions (series). For what values of "r" is this sum "defined"?
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