December 2018 1 23 Report
Dari barisan aritmatika diketahui U3 = 18 dan U7 = 38. Jumlah 24 suku pertama adalah...

a. 786
b. 1.248
c. 1.572
d. 3.144

# pakai rumus dan cara yg jelas..
*thxqiuu
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