Asked by Toby
If the sum of the first n terms of the series 4+7+10+... is 209, find n
Answers
Answered by
oobleck
a = 4
d = 3
n/2 (2a+(n-1)d) = 209
Now just plug in your numbers and solve for n.
d = 3
n/2 (2a+(n-1)d) = 209
Now just plug in your numbers and solve for n.
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