3. Rumus suku ke-n dari: 12, 15, 18, 21,.... adalah... a. 3n+9 b. 4n+8 c. 2n + 10 d. 5n+7
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Jawaban:
a. 3n+9
Penjelasan:
U1 : 3.1+9 = 12
U2 : 3.2+9 = 15
U3 : 3.3+9 = 18
U4 : 3.4+9 = 21