Q.

What is the mean proportional of 6 and 24?


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a

15

b

12

c

8

d

144 

answer is B.

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Detailed Solution

Here, we need to find the mean proportional of 6 and 24.
Let the mean proportional of the given numbers be x.
According to the given condition,
6:x=x:24 6 x = x 24   x×x=6×24  
x 2 =144 x=12  
Thus, the mean proportional of 6   and 24 is 12.
Therefore, option 2 is correct.
 
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What is the mean proportional of 6 and 24?