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b = 3
dicari a :
U15 = a + (n-1) b
54 = a + (15-1) 3
54 = a + 42
54 - 42 = a
a = 12 ✔
Pembuktian:
U15 = 12 + (15-1) 3
U15 = 12 + 42
U15 = 54 ✔