The general term formula of known sequence (an) is an = 4N-1, Sn represents the sum of the first n terms of the sequence, and how much is S6 equal to?

An=4n-1；A1=4*1-1=3；A6=4*6-1=23.
S6=(A1+A6)*6/2=3(3+23)=3*26=78.

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