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a=2, b=3, n=20
S20=1/2 (20) (2.2+(20-1)3)= 10 (4+(19)3)=10 (4+57)=10 (61) = 610
un=a+(n-1)b
101=6+(n-1)5
101-6=5n-5
100=5n n=20
S20=n/2(a+un)
=20/2(6+101)
=10(107)=1070
bener ga bro?