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Thx
U2 = -20
U5 = -5
Dicari dulu bedanya
b = 5
Un = a + (n-1) b
U2 = a + (2-1) 5
-20 = a + 5
-20 - 5 = a
-25 = a
Jadi U13 = -25 + (13-1) 5
= -25 + 60
= 35 ( C )
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