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March 20th 2008, 10:28 PM
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Chrispy
Peasant He/Him Canada
I'm a man, but I can change, if I have to.I guess. 
You can say that.
For a real kicker, you can always try to make them impossible.

Talking about impossible math, anyone got any ideas how to solve:

Sum: 0 --> n; A* (y^n*x^0 + y^(n-1)*x^1 ... y^1*x^(n-1) + y^0*x^n)

Solve, as in put in a form that *isn't* a friggen series. It's for a compound interest problem with deposits varied by a constant inflation (aka, increasing wages). So with inflation at 2% per unit time n, and savings interest at 1% with an initial deposit of 10$, you'd have after 3 unit times:
10 * (1.01^3 + 1.01^2*1.02^1 + 1.01^1*1.02^2 + 1.02^3) = 41.82$

I'm thinking it's impossible, unless x or y are in deflation. The whole reason I'm trying to do this, is to see if there's an optimal point in time to make an appropriate 'jump' to a different, higher savings rate, if there is a constant cost involved in the jump, and a finite number of months where the money will still be 'saved'.