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u7 => a + 6b = 13 -
- 4b = - 8
b = 2
a + 2.2 = 5
a + 4 = 5
a = 1
rumus = a + (n-1)b
= 1 + (n-1)2
= 1 + 2n - 2
= 2n - 1
Sehingga, rumus suku ke-n :