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penjelasan :
suku pertama 3
suku kedua 5
suku ketiga 7
suku keempat 9
berarti kelipatan 2
semoga membantu
a = 3
b = U2-U1
= 5-3
= 2
U4 = a + (n-1)b
= 3+ (4-1)2
= 3 + (3)2
= 3 + 6
= 9