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5, 8, 11, 14, .... Un
Dit. Suku ke-25 (U25)?
Jawab...
a = 5
b = u2 - u1 = 8 - 5 = 3
Un = a + (n-1) b
U25 = a + 24b
U25 = 5 + 24 (3)
U25 = 5 + 72
U25 = 77
Semoga membantu.. ^_^
+3 +3
u25=5+(25-1)3
=5+72
=77