1) By what least number 4320 be multiplied to obtain a number which is a perfect cube ? A) 40 B) 50 C) 60 D) 70 Answer: Option BExplanation:Clearly, $4320=2^{3}\times 3^{2}\times 2^{2}\times5$ to make perfect cube we need to add $2\times 5^{2}$ = 50
