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Verified answer
Mapel : MatematikaBab : Barisan dan deret
U3 + U5 = 20
U7 = 19
U3 + U5 = a + 2b + a + 4b = 20
===> 2a + 6b = 20
U7 = a + 6b = 19
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a = 1
a + 6b = 19
1 + 6b = 19
6b = 18
b = 3
b = 3