Question:
Find the missing number:
0.5, 2, 4.5, 8, 12.5, ?.
Find the missing number:
0.5, 2, 4.5, 8, 12.5, ?.
0.5, 2, 4.5, 8, 12.5, ?.
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If first-level differences are not constant, check the second-level differences.
Updated On: Jun 26, 2026
- 16
- 18
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- 19
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Analyze the differences or the underlying function of the terms.
Step 2: Analysis
Differences:
$2 - 0.5 = 1.5$
$4.5 - 2 = 2.5$
$8 - 4.5 = 3.5$
$12.5 - 8 = 4.5$
The difference is increasing by 1.0 each time.
Step 3: Calculation
Next difference = $4.5 + 1.0 = 5.5$.
Missing number = $12.5 + 5.5 = 18.0$. Final Answer: (2)
Analyze the differences or the underlying function of the terms.
Step 2: Analysis
Differences:
$2 - 0.5 = 1.5$
$4.5 - 2 = 2.5$
$8 - 4.5 = 3.5$
$12.5 - 8 = 4.5$
The difference is increasing by 1.0 each time.
Step 3: Calculation
Next difference = $4.5 + 1.0 = 5.5$.
Missing number = $12.5 + 5.5 = 18.0$. Final Answer: (2)
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