Question:
Find the odd number in the following number series:
\[
28,\ 44,\ 64,\ 90,\ 116
\]
Find the odd number in the following number series:
\[ 28,\ 44,\ 64,\ 90,\ 116 \]
\[ 28,\ 44,\ 64,\ 90,\ 116 \]
Show Hint
When checking number series, differences often reveal hidden arithmetic patterns.
Updated On: Apr 21, 2026
- 90
- 116
- 28
- 64
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The Correct Option is A
Solution and Explanation
Concept:
Check the pattern in differences between consecutive terms.
Step 1: Find differences.
\[ 44 - 28 = 16 \] \[ 64 - 44 = 20 \] \[ 90 - 64 = 26 \] \[ 116 - 90 = 26 \]
Step 2: Expected pattern.
The differences should follow: \[ +16,\ +20,\ +24,\ +28 \] So the correct third difference should be: \[ 64 + 24 = 88 \ ({not } 90) \]
Step 3: Conclusion.
90 breaks the pattern.
Hence, the odd number is 90.
Step 1: Find differences.
\[ 44 - 28 = 16 \] \[ 64 - 44 = 20 \] \[ 90 - 64 = 26 \] \[ 116 - 90 = 26 \]
Step 2: Expected pattern.
The differences should follow: \[ +16,\ +20,\ +24,\ +28 \] So the correct third difference should be: \[ 64 + 24 = 88 \ ({not } 90) \]
Step 3: Conclusion.
90 breaks the pattern.
Hence, the odd number is 90.
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