Question
Sum of digits of the smallest number by which 1440 be multiplied so that it becomes a perfect cube, is
Answer: Option D Answer: (d)1440 = $2 × 2 × 2 × 2 × 2 × 3 × 3 × 5 = 2^3 × 2^2 × 3^2 × 5$To make 1440 a perfect cube, it must be mulitplied by 2 × 3 × 5 × 5 = 150.∴The required sum = 1+5 + 0 = 6
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