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b = 3
Un = a + (n-1)b
Un = 4 + (n-1)3
Un = 4 + 3n - 3
Un = 3n + 1
semoga membantu ya :)
beda = b = 7-4 = 3
Un = a + (n-1)b
Un = 4 + (n-1)3
Un = 4 + 3n - 3
Un = 1 + 3n
Un = 3n + 1