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3+97 : 100
5+95 : 100
ada 50 pasangan bilangan ganjil di kali 100
50x100 : 500
un=1+2n-2=2n-1
2n-1=99
2n=100
n=50
S50/50/3(1+99)=25(100)=2500
jwbnnya adalah 2500