Multiple choice

Directions: In the following number series, only one number is wrong. Find out the wrong number. 5 9 18 34 60 95 144

  1. 144

  2. 95

  3. 18

  4. 60

  5. 9
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D Correct answer
Explanation

The differences are: 9-5=4, 18-9=9, 34-18=16, 60-34=26, 95-60=35, 144-95=49. The differences are squares: 2^2, 3^2, 4^2, 5^2, 6^2, 7^2. The difference 26 is wrong; it should be 25 (5^2). Thus 60 is the wrong number (34+25=59).

AI explanation

The differences between the terms are squares of consecutive integers starting from 2. The sequence of additions should be +4, +9, +16, +25, +36, making the terms 5, 9, 18, 34, 59, 95. Therefore, the number 60 is incorrect and should be 59. The result is 60.

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