Number Series, Coding, Odd Man OutMTP May 18Question 2175 of 217
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Find the odd man out 1,4,9,16,20,36,49\displaystyle 1, 4, 9, 16, 20, 36, 49

Options

A1\displaystyle 1
B9\displaystyle 9
C20\displaystyle 20
D36\displaystyle 36
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Correct Answer

✅ Option c — 20\displaystyle 20

All Options:

  • A1\displaystyle 1
  • B9\displaystyle 9
  • C20\displaystyle 20
  • D36\displaystyle 36

Detailed Solution & Explanation

Let's check the perfect square property for each number in the series:
- 1=12\displaystyle 1 = 1^2
- 4=22\displaystyle 4 = 2^2
- 9=32\displaystyle 9 = 3^2
- 16=42\displaystyle 16 = 4^2
- 36=62\displaystyle 36 = 6^2
- 49=72\displaystyle 49 = 7^2
- 20\displaystyle 20 is not a perfect square (42=16\displaystyle 4^2 = 16 and 52=25\displaystyle 5^2 = 25).

Since 20\displaystyle 20 is the only number in the series that is not a perfect square, it is the odd man out.

Hence, **Option C** is the correct answer.

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