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  1. The least number which must be added to 1728 to make it a perfect square is ______.
    1. 36
    2. 32
    3. 38
    4. 30
Correct Option: A

41 × 41 = 1681
42 × 42 = 1764
∴  Required answer
= 1764 – 1728 = 36


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