Deret Aritmatika
#edit_soal
#bukan (7n - 5)
12 + 19 + 26 + 33 + ... + (7n + 5)
a = 12
Sn = n/2 (a + Un)
Sn = n/2 (12 + 7n + 5)
Sn = n/2 (7n + 17)
12 + 19 + 26 + 33 + ... + (7n + 5) = n/2 (7n + 17)
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Deret Aritmatika
#edit_soal
#bukan (7n - 5)
12 + 19 + 26 + 33 + ... + (7n + 5)
a = 12
Sn = n/2 (a + Un)
Sn = n/2 (12 + 7n + 5)
Sn = n/2 (7n + 17)
12 + 19 + 26 + 33 + ... + (7n + 5) = n/2 (7n + 17)