Question

Which of the following does not belong to the group?

• A. 121
• B. 144
• C. 169
• D. 225

Hint:

Odd-one-out problems often rely on number properties such as parity, primality, or patterns.

Answer 1

The Correct Option is B

Step 1: Identify the nature of the numbers.
All options are perfect squares: \[ 121 = 11^2,\quad 144 = 12^2,\quad 169 = 13^2,\quad 225 = 15^2 \] Step 2: Analyze the base numbers.

• 11, 13, 15 are odd numbers
• 12 is an even number

Step 3: Identify the odd one out.
Only 144 is the square of an even number. All others are squares of odd numbers.

Conclusion: The number that does not belong in the group is: 144