Discussion
The geometric mean between two numbers is 12. If one number is 9, what is the other number?
Answer: B
\[ \text{G.M.} = \sqrt{ab} \quad\Longrightarrow\quad 12 = \sqrt{9b} \]
\[ 144 = 9b \quad\Longrightarrow\quad b = 16 \]
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