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cari suku awal
U3 = a +(3-1)b
U3 = a + 2b
7 = a + (2 x 2)
7 = a + 4
a = 7-4
a = 3
sehingga diketahui a = 3, dan b=2
Un = a +(n-1)b
Un = 3 +(n-1)2
Un = 3 + 2n - 2
Un = 1 + 2n