143 → 122 - 1,257 → 162 + 1, 195 → 142 - 1, 15 → 42 - 1, Hence, '257' is odd one.

Curioustab

NA

Correct Answer: 15

Explanation:

143 → 12² - 1,257 → 16² + 1, 195 → 14² - 1, 15 → 4² - 1,
Hence, '257' is odd one.

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