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1. cari beda
beda =
beda = 3
2. cari suku pertama
Un = a+(n-1)b
U6 = a + (6-1) 3
18 = a + (5) 3
18 = a + 15
3 = a
3. mencari jumlah 16 suku
Sn = n/2 (2a + (n-1) b)
S16 = 16/2 (2x3 + (16-1) 3)
S16 = 8 (6 + 15 x 3)
S16 = 8 (6 + 45)
S16 = 8 (51)
S16 = 408
Semoga bermanfaat :) jadikan yg terbaik ya :)