10.2 arithmetic quiz
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Find the following sum: the E lookin thing with 25 on top and i=1 on bottom
Find 1 2 and 3 then ...25 Then do the sum of nth terms 1400
The Sum of the First n Terms of an Arithmetic Sequence
Sn= n/2(a1 + an)
Find the sum of the first 100 terms of the arithmetic sequence: 1, 3, 5, 7, Á .
We use the formula for the general term of a sequence to find a100 . Use the formula for the sum of the first n terms of a to find the sum of the 100 terms
General term or arithmetic sequence
an =a1 +1n-12d.
