Find the odd number out from the given options:
Answer and explanation
Correct answer: A. 225
- Step 1: Express each number as a perfect square: , , , .
- Step 2: Notice that 11, 13, and 17 are prime numbers.
- Step 3: In contrast, 15 is a composite number (). Thus, 225 is the odd one out.
Answer
225.
Why not the others: 121, 169, and 289 are all squares of prime numbers, forming a consistent set.
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