April 2019 1 319 Report
Diketahui barisan aritmetika dengan suku kelimabelas 40 dan suku kesepuluh 25. Rumus suku ke-n barisan tersebut adalah...........

A. Un = 3n-5
B. Un = 3n+5
C. Un = 5n-3
D. Un = 5n+3
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