16, 25, 36, 72, 144, 196, 225
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36
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72
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196
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225
Reveal answer
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B
Correct answer
Explanation
The series includes 16 (4²), 25 (5²), 36 (6²), 144 (12²), 196 (14²), 225 (15²) - all perfect squares. The number 72 is not a perfect square, making it the odd one out. All other numbers follow the square number pattern.
AI explanation
Every other number is a perfect square (16=4², 25=5², 36=6², 144=12², 196=14², 225=15²), but 72 is not a perfect square, making it the one that doesn't belong. The key is recognizing the perfect-square pattern shared by the rest of the terms.