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a+8b=20
8b=16
b=2
S10=5(2a+(n-1)b)
=5(8+9(2))
=5(8+18)
=5.26
=130
b=2
s10= n/2(2a+(n-1)b)
=5 (8 + 18)
=5(26)
= 130