Answers

2016-08-02T22:23:03+08:00
A1=1
an=1600
n=?
sn=?
d=2

n=an-a1/d
n=1600-1/2
n=1599/2
n=799.5

sn=n/2(a1+an)
sn=799.5/2(1+1600)
sn=399.75(1601)
sn=?
use calculator
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