Question : The mean proportional of 6 and 54 is _______ more than 15.
Option 1: 3
Option 2: 6
Option 3: 4
Option 4: 5
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Correct Answer: 3
Solution : Mean proportion of 6 and 54 = $\sqrt{6 × 54}=\sqrt{324}= 18$ $\therefore$ Difference = 18 – 15 = 3 Hence, the correct answer is 3.
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