The geometric mean of two numbers is $81$ . One of the numbers is $9$ . What is the other number?

1

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Solution

The correct option is A $1$
Given, G.M. $= 81, a = 9$
We need to find vaue of $b$
Geometric mean $= \sqrt{a b}$
$81 = \sqrt{9 b}$
Squaring on both the sides, we get
$9 = 9 b$
$\Rightarrow b = 1$

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