Tentukan angka berikutnya dalam deret: 7, 10, 15, 22, 31, 42, 55, ...

Answer and explanation

Correct answer: C. 70

Selisih antarsuku membentuk barisan aritmatika bertambah 2: 3, 5, 7, 9, 11, 13. Selisih berikutnya 15, sehingga suku berikutnya 55 + 15 = 70.

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