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  1. The smallest positive integer, when multiplied by 392, the product is a perfect square, is
    1. 6
    2. 5
    3. 3
    4. 2
Correct Option: D

392 = 2 × 2 × 2 × 7 × 7
= 22 × 72 × 2
Clearly, when 392 is multiplied by 2, the product is a perfect square.


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