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Oke ganti lagisn=1/2.n(2.u1+(n-1)b
s50=1/2.50(2.50+(50-1) 2
s50=1/2.50(2.50+(49)2
s50=1/2.50(100+98)
s50=25(198)
s50=4950
oke udah maaf kalo salah