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Q.

The least number by which 216 must be divided to make the result a perfect square, is:


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a

3

b

4

c

6

d

9 

answer is C.

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Detailed Solution

Given number is 216.
Writing the prime factors of 216.
216=2×2×2×3×3×3
Clearly, in order to make it a perfect square, it must be divided by 2×3 i.e., 6.
Thus, the number 216 must be divided by 6 to get a perfect square.
Therefore, option (3) is correct.
 
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