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misal U4 = 3 + (4 x 5) = 3+20=23
Diketahui : a = 8 b = 5
Un = a +( n - 1 )b
= 8 + ( n - 1 ) 5
= 8 + 5n - 5
= 5n + 3
Jadi rumus suku ke-n adalah 5n + 3.
Semoga membantu.