Find the sum to n terms of the series whose rth term is 3r - 2r
The Attempt at a Solution
So I tried this
rlog3 - rlog2 = n(n+1)/2 log3 - n(n+1)/2 log2
then I realized this was kind of useless, the only thing I could get from this is
n(n+1)/2 log (3/2) , then I don't know what to do with it.
the answer in the book is 3n+1/2 -2n+1 + 1/2