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Verified answer
A = 2b = 7 - 2 = 5
Un = bn + a - b
U12 = 5(12) + 2 - 5
= 60 - 3
= 57
b = 7 - 2
= 5
Un = a + (n-1)b
U12 = 2 + (12 - 1)5
= 2 + 11x5
= 2 + 55
= 57
Maka, nilai U12 nya adalah 57.
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