Multiple choice

In the given series, only one number is wrong. Find the wrong number. 13, 16, 12, 15, 11, 14, 9

  1. 9

  2. 11

  3. 14

  4. 15

  5. 16
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A Correct answer
Explanation

The pattern is +3, -4, +3, -4, +3, -4. Starting from 13: 13+3=16, 16-4=12, 12+3=15, 15-4=11, 11+3=14, 14-4=10. The last number is 9, but it should be 10.

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