Multiple choice

Directions: In the following numbers, one number is wrong. Find out the odd number.

20, 21, 25, 34, 49, 75, 111

  1. 49

  2. 25

  3. 20

  4. 75

  5. 111
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A Correct answer
Explanation

The differences between numbers are 12, 22, 32, 42, 52, 62.

20 + 12 = 21; 21 + 22 = 21 + 4 = 25;25 + 32 = 25 + 9 = 34;34 + 42 = 34 + 16 = 50; 50 + 52 = 50 + 25 = 75; 75 + 62 = 75 + 36 = 111. 49 is the odd number.

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