September 2018 1 80 Report
Rumus suku ke-n dari deret aritmatika yang jumlah n suku pertamanya dirumuskan dengan Sn =  n^{2} - 3n adalah...
a. Un = 2n - 4
b. Un = 4n - 2
c. Un = -2 + 2n
d. Un = -2 - 4n
e. Un = 2 - 4n
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