Problem 115 of 7
Compute probability of at least one event using complement counting: at least one vowel in a 3-letter sequence chosen randomly from the alphabet (with replacement).
Using a hint is okay. It just tells the trainer to give you a little more review.
Hidden until you reveal it.
count complement and subtract from 1.
Hidden until you reveal it.
Complement of at least one is none.
Enter your answer
Your answer is equivalent to the expected form.
Walkthrough
Full solution stays hidden until you ask for it.
1. Identify the complement event as none of the desired outcome.
2. Compute the complement probability.
3. Subtract from 1.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Counting only exactly one when prompt asks at least one.