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U3 = 18 --> U3 = a+2b = 18
U7 = 38 --> U7 = a+6b = 38
Setelah dieliminasi, didapatkan :
b = 5 dan a = 8
Sn = n/2(2a+(n-1)b)
S24 = 24/2 (2×8+(24-1)5)
= 12 (16+115)
= 12 × 131
= 1572