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15+(n-1) -5
15-5n
U2 = 10 _
- 1 = 5
b = -5
un = a + ( n - 1 ) x b
= 15 + ( n - 1 ) x b
= 15 + ( n - 1 ) x - 5
= 15 - 5n + 5
= 20 - 5n ( D )
itu yang benar ya