Multiple choice

Find the missing number in the following series. \newline ?, 12, 18, 10, 6, 14, 5, 0, 10

  1. 12

  2. 10

  3. 6

  4. 15
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is an interleaved series with two patterns. Positions 1,4,7,10: ?, 10, 5, 10 - pattern subtracts 5 then adds 5, so ? must be 15. Positions 2,5,8: 12, 6, 0 - subtracts 6 each time. Position 3,6,9: 18, 14, 10 - subtracts 4 each time. The missing number is 15.

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