Q30 (2017). The age of Mr. X last year was the square of a number and it would be the cube of a number next year. What is the least number of years he must wait for his age to become the cube of a number again?
(a) 42 (b) 38
(c) 25 (d) 16
UPSC Civil Service (Preliminary) 2017 - GS2 - CSAT
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