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Multiple choice

Find the wrong number in the series given below. 1, 5, 14, 30, 56, 91

  1. 5

  2. 14

  3. 30

  4. 56

  5. 91
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The differences are: 5-1=4, 14-5=9, 30-14=16, 56-30=26, 91-56=35. The pattern of differences is 2^2, 3^2, 4^2, 5^2 (25), 6^2 (36). The difference 26 should be 25, making 56 the wrong number (30+25=55, 55+36=91).

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