Multiple choice

In the following sequence, one number is wrong. Find the wrong number. 9, 23, 51, 106, 219, 443

  1. 23

  2. 51

  3. 106

  4. 219
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C Correct answer
Explanation

Pattern: 9*2+5=23, 23*2+5=51, 51*2+5=107, 107*2+5=219. The number 106 is incorrect; it should be 107.

AI explanation

The series follows the pattern of multiplying by 2 and then adding 5. Applying this, 9 multiplied by 2 plus 5 equals 23, 23 multiplied by 2 plus 5 equals 51, and 51 multiplied by 2 plus 5 should equal 107. Therefore, the number 106 is incorrect.

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