bedanya = 3
U3 = a+2b
= a+2.3
= a+6
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bedanya = 3
U3 = a+2b
= a+2.3
= a+6
Un = a + (n - 1)b
b adalah "beda", diketahui bahwa beda nya adalah 3
Dari rumus dasarnya, maka
U3 = a + (n - 1)b
U3 = a + (3 - 1)(3)
U3 = a + (2 x 3)
U3 = a + 6