Multiple choice

Find the missing number in the series. 2, 1, 1, 1.5, 3, ?

  1. $5.5$
  2. $6.5$
  3. $7.5$
  4. $6$
  5. $7$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pattern is: ÷2, ×1, ÷0.67, ×2, ÷0.4, ×2.5. The denominators decrease by 0.33, 0.27, 0.3 (approaching 0.33 decrement). After 3÷0.4=7.5, the next operation is ×2.5 giving 18.75. However, this series has multiple plausible interpretations. Option C (7.5) is a defensible answer based on consistent decrement in multiplier values.

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