jawaban terlampir semoga membantu maaf kalau salah
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a = 120
Un = 288
b = 12
Ditanya :
Sn?
Jawab :
Un = a + (n - 1)b
288 = 120 + (n - 1)12
288 = 120 + 12n - 12
288 = 108 + 12n
12n = 180
n = 15
Sn = (a + Un)
S15 = (120 + 288)
S15 = 7,5(408)
S15 = 3.060
jawaban terlampir semoga membantu maaf kalau salah