Problem 136 of 7
Use permutations or combinations in a without-replacement probability problem: choose 2 winners from 20 including one named person.
Using a hint is okay. It just tells the trainer to give you a little more review.
Hidden until you reveal it.
choose counting or sequential probability strategy.
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Use ordered counts for ordered roles and unordered counts for selections.
Enter your answer
Your answer is equivalent to the expected form.
Walkthrough
Full solution stays hidden until you ask for it.
1. Determine whether the outcome is ordered or unordered.
2. Count favorable outcomes with the same structure as total outcomes.
3. Divide favorable by total.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Mixing ordered numerator with unordered denominator.