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Bab : Baris dan Deret
Kelas : IX
Dua suku berikutnya dari 3,4,6,9.....adalah
3, 4, 6, 9, 13, 18
1 2 3 4 5 (beda)
Polanya adalah beda bertambah 1
U1 = a
U2 = U1 + 1 = 3 + 1 = 4
U3 = U2 + 2 = 4 + 2 = 6
U4 = U3 + 3 = 6 + 3 = 9
U5 = U4 + 4 = 9 + 4 = 13
U6 = U5 + 5 = 13 + 5 = 18
Jadi isinya 13 dan 18