February 2019 1 37 Report
Suku ke dua deret aritmatika sama dengan 15, sedangkan jumlah 10 suku pertamanya 255, maka suku keenam deret tersebut adalah …
A. 26
B. 27
C. 28
D. 29
E. 30

Sama cara nya ya, biar ngerti hehehe. thanks..
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