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OpenStudy (anonymous):
I have that the sum from n to infinity of n*(2/3)^(n-1) is 9. Why?
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OpenStudy (anonymous):
a summation of the form n^n is hardly close to 9.
OpenStudy (anonymous):
oh, nevermind, (2/3)^n
OpenStudy (nikvist):
OpenStudy (anonymous):
Medal for nikvist :)
OpenStudy (anonymous):
Sorry for still not entirely getting it, but... Where does the (2/3) S come from in the second step? how does it go from 3 to 9 at the end? Thanks
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