Multiple choice

Select the missing number from the given series. $36, 18, 54, 27, 81, ?, 121.5$

  1. 40

  2. 38

  3. 40.5

  4. 41.5
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Find the pattern in the series: 36, 18, 54, 27, 81, ?, 121.5. Pattern: alternate operations - divide by 2, then multiply by 3. 36÷2=18, 18×3=54, 54÷2=27, 27×3=81, 81÷2=40.5, 40.5×3=121.5. The missing number is 81÷2=40.5. Options A(40), B(38), and D(41.5) are incorrect.

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