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  1. Area of the floor of a cubical room is 48 sq.m. The length of the longest rod that can be kept in that room is
    1. 9 metre
    2. 12 metre
    3. 18 metre
    4. 6 metre
Correct Option: B

Length of room = √48 = 4√3 metre
∴ Diagonal = √3 × (4√3)²
= √3 × 16 × 3 = 12 metre


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