Multiple choice

Directions: Complete the following number series:

1.5, 5, 10.5, 18, 27.5, ?

  1. 36

  2. 30

  3. 39

  4. 42

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is clear that the pattern of the series is, 1 x 1.5 = 1.5, 2 x 2.5 = 5, 3 x 3.5 = 10.5, 4 x 4.5 = 18, 5 x 5.5 = 27.5, and so on. But 30 = 6 x 5. It should be 6 x 6.5 = 39

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