Multiple choice

Which one of the following supplies the missing number in this series - 2, 6, 12, 20, 30, 42, 56, ?

  1. 64

  2. 66

  3. 72

  4. 76
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C Correct answer
Explanation

The differences between consecutive terms are 4, 6, 8, 10, 12, 14. The next difference should be 16. 56 + 16 = 72.

AI explanation

The differences between consecutive terms are 6 minus 2, 12 minus 6, 20 minus 12, and so on, which gives 4, 6, 8, 10, 12, and 14. The next difference must be 16, so adding 16 to 56 gives 72.

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