A) 2 : 1
B) 5 : 1
C) 7 : 15
D) 9 :14
Correct Answer: B
Solution :
[b] Third proportional of a and b is \[\frac{{{b}^{2}}}{a}\]whereas proportional of a and b is \[\sqrt{ab}\] \[\Rightarrow \frac{30\times 30}{12}:\sqrt{9\times 25}=5:1\]You need to login to perform this action.
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