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Sequence {an}\{a_n\}{an} is such that an+1+(−1)nan=2n−1a_{n+1}+(-1)^n a_n=2n-1an+1+(−1)nan=2n−1. Find ∑k=160ak\displaystyle \sum_{k=1}^{60} a_kk=1∑60ak.
Have a look at my problem set: SAT 1000 problems
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