How would you do a question like this?
Given the first term, a, the common difference, d, and the last term, l, find the sum of the following arithmetic series:
a=8, d=3, l=65
x
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NeeIam
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- 20-02-2016 14:44
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(Original post by NeeIam)
How would you do a question like this?
Given the first term, a, the common difference, d, and the last term, l, find the sum of the following arithmetic series:
a=8, d=3, l=65
Sn= n/2(a+l)
U also have to find n 65=a+(n-1)d -
NeeIam
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- 20-02-2016 14:57
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- 20-02-2016 14:59
(Original post by NeeIam)
I don't understand what I'm meant to do with the 2nd formula, how to find n -
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- 20-02-2016 15:00
(Original post by Xenon17)
n is between the ( and-
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Updated: February 20, 2016
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