Multiple choice

Each of the following number series one number is wrong. Find out the odd number. 4 8 24 168 840 9240

  1. 24

  2. 840

  3. 8

  4. 168

  5. 9240

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D Correct answer
Explanation

The pattern multiplies by consecutive prime numbers: 4x2=8, 8x3=24, 24x5=120, 120x7=840, 840x11=9240. The term 168 breaks this pattern - it should be 120 (24x5, not 24x7). 168 is the odd number.