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  1. The sum of the digits of the smallest number which, when multiplied by 1800, gives a perfect cube, is :
    1. 2
    2. 3
    3. 6
    4. 8
Correct Option: C

1800 = 2 × 2 × 2 × 3 × 3 × 5 × 5 = 23 × 32 × 52
To make 1800 a perfect cube, it must be multiplied by 15 (least number).
∴  Required sum = 1 + 5 = 6


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