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ke 20 = 98
ke 25 = 123
b=5
U20= a + 19b = 3 +19(5) = 3 + 95 = 98
U25= a + 24b = 3 + 24(5) = 3 + 120 = 123
Jumlah U20 + U25 = 98 + 123 = 221
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