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semua ditambahkan menjadi = 594
9+18+27+…+99
a=9, b=9, Un=99
n=99/9=11
Sn=n/2(a+Un)
S11=11/2(9+99)
S11=5,5(108)
S11=594
Jadi 9+18+27+…+99=594