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Un = a + (n-1) b
2 + (n-1) 4
2 + 4n -4
Un = 4n - 2
b) a = 2, r = 3
Un = a
= 2 x
semoga membantu :)
a + (n-1).b
2 + (n-1).4
2 + 4n-4
= 4n-2