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Multiple choice

The missing number in the sequence (5, 6, 15, ?, 89, 170, 291) is

  1. 50

  2. 40

  3. 42

  4. 32

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pattern involves differences: 6-5=1, 15-6=9, ?-15=25, 89-?=49, 170-89=81, 291-170=121. The differences are 1, 9, 25, 49, 81, 121 (squares of odd numbers). So 49+40=89.

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