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2. bil ganjil rumusnya = 2(n)-1= 2.100-1=199
3. Sn= n/2(2a+(n-1)b= 100/2 (2.2+(100-1)2)=50.(4+99.2)=50.202=10100
4. Sn=50 (2.1+ 99.2)=50.200= 10000