October 2018 2 99 Report
Diketahui a, a + b, dan 4a + b merupakan 3 suku berurutan barisan aritmatika.
Jika a, a + b, dan 4a + b + 9 merupakan suatu barisan geometri
maka b - a = ?
pilihan: (A) 1 (B) 2 (C) 3 (D) 4 (E) 5
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