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b = 15 - 10 = 5
Un = a + (n - 1)b
= 10 + 5(n - 1)
= 5n + 5
U25 = a + 24b
= 10 + 24(5)
= 10 + 120
= 130
=10+(n-1)5
pola ke-25=10+(25-1)5
=10+(24x5)=10+120=130