SOLUTION: The nth term of a sequence is donated by 3n (2n - 1)find the sum of the first five term

Question 1133314: The nth term of a sequence is donated by 3n (2n - 1)find the sum of the first five term
Found 2 solutions by rothauserc, ikleyn:
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
x(n) = 3n(2n-1) = 6n^2 -3n
:
the first 5 terms,
:
3, 18, 45, 84, 135
:
sum of first 5 terms is 285
:
Answer by ikleyn(52788) (Show Source): You can put this solution on YOUR website!
.
The n-th term of a sequence is 3n*(2n - 1). Find the sum of the first five terms.
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