October 2018 2 35 Report
Pada barisan bilangan aritmetika, diketahui bedanya 4 dan suku ke-5 barisan bilangan adalah 18. Rumus suku ke-n barisan bilangan tersebut adalah...
a. Un = 4n - 1
b. Un = 4n - 2
c. Un = 3n + 3
d. Un = 3n + 4
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