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U5 = 30 --> a+4b = 30
U25 = 70 --> a+24b = 70 _
-20b = -40
b = 2
a+4.2 = 30
a = 30-8
a = 22
U5 = a+4b
= 22+4.2
= 22+8
= 30
jadi suku ke-5 adalah 30
semoga membantu ya :)