SOLUTION: Sn=n/2(3n+13) find t30=?

SOLUTION: Sn=n/2(3n+13) find t30=?

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Question 1071138: Sn=n/2(3n+13) find t30=?
Answer by ikleyn(52790) (Show Source): You can put this solution on YOUR website!
.
t(30) = S(30) - S(29).

Substitute and calculate.

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