Except '189', all the others are square number. 25 → 52, 64 → 82, 225 → 152 and 121 → 112

Curioustab

NA

Correct Answer: 189

Explanation:

Except '189', all the others are square number.
25 → 5², 64 → 8², 225 → 15² and 121 → 11²

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