Answers

2016-06-30T21:09:21+08:00
-22,-17,-12,-7,-2,3,8,13,18,23
formula
d=5
an=23
a1=-22
Sn=n/2 [2a+(n-1)d]
=10/2 [2(-22)+(10-1)5
=5[-20+9(5)]
=5[-20+45]
=5[25]
=125
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