June 2019 1 9 Report
Diketahui a,b dan c berturut turut suku ke 2, ke 3 dan ke 4 suatu barisan geometri dengan b > 0. Jika a.c/ b+2 =1, maka nilai b adalah....
A. 1
B. 2
C. 5/2
D. 3
E. 7/2
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