Multiple choice

Find out the wrong number in the following number series. $120\ \ \ 15\ \ \ 100\ \ \ 25\ \ \ 75\ \ \ 37.5$

  1. 15

  2. 25

  3. 75

  4. 100

  5. 37.5
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A Correct answer
Explanation

The series follows the pattern: divide by 8, multiply by 20/3, divide by 4, multiply by 3, divide by 2. 15 breaks this alternating pattern - it should be approximately 26.67 (120 x 20/3 / 15). The correct term fitting the pattern is 26.67, not 15.

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