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sehingga Sn=S17 = 17² = 17 × 17 = 289
beda dari barisan bilangan = 2
ditanyakan Sn
rumus:
Sn = n/2 (2a+(n-1)b)
= 17/2 (2(1) + (17-1)2)
= 17/2 (2+32)
= 17/2 (34)
= 289