determine the sum of first 35 terms of AP is a 2= 2 and a 7= 22
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a2=2 and a7=22
a+d=2-----------1
a+6d=22-------2
-5d=-20
d=4
substitute in equation 1 =a+d=2
a=-2
a35=a+34d
=-2+34[4]
=-2+136=134
=
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