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b = beda = 27-20 = 7
Un = a+(n-1)b
Maka rumus suku ke-n barisan ini ialah
Un = 20+(n-1)7
b = 27 - 20 = 7
Un = a + (n - 1)b
= 20 + 7(n - 1)
= 7n + 13