2017 · Q88
Which one of the following is the smallest number by which 2880 must be divided in order to make it a perfect square?
general-mental-abilityquantitative-aptitude
- A3
- B4
- C5
- D6
Explanation
2880 = 2^6 × 3^2 × 5. For a perfect square every prime must occur to an even power; only the single factor 5 is unpaired, so 2880 must be divided by 5. Hence (C).