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Probability
Grade 12

Question:

<p>N-ball bag problem. Find N given ball transitions.</p>

Step-by-Step Solution

Key Concept: Blue balls / (N-2) = 2/9.
<p>(N-9)/(N-2) = 2/9 => 9N-81 = 2N-4 => 7N=77 => N=11.</p>
Correct Answer: 11

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