Probabilities from dependent events
Probabilities from dependent events.
- At each split, the outgoing probabilities sum to 1.
- Multiply along a route; add mutually exclusive routes that meet the question.
- Without replacement, update the counts and total for the second draw.
Example 1
A bag contains 2 red and 3 blue counters. Two counters are drawn without replacement. Find the probability of two reds.
Example 2
A bag contains 3 red and 3 blue counters. Two counters are drawn without replacement. Find the probability of two reds.
Your turn
A bag contains 4 red and 3 blue counters. Two counters are drawn without replacement. Find the probability of two reds.
Check answer
A bag contains 5 red and 3 blue counters. Two counters are drawn without replacement. Find the probability of two reds.
Check answer
A bag contains 6 red and 3 blue counters. Two counters are drawn without replacement. Find the probability of two reds.
Check answer
A bag contains 7 red and 3 blue counters. Two counters are drawn without replacement. Find the probability of two reds.
Check answer
A bag contains 8 red and 3 blue counters. Two counters are drawn without replacement. Find the probability of two reds.
Check answer
A bag contains 4 red and 3 blue counters. Two counters are drawn without replacement. Find the probability of two reds.
AnswerA bag contains 5 red and 3 blue counters. Two counters are drawn without replacement. Find the probability of two reds.
AnswerA bag contains 6 red and 3 blue counters. Two counters are drawn without replacement. Find the probability of two reds.
AnswerA bag contains 7 red and 3 blue counters. Two counters are drawn without replacement. Find the probability of two reds.
AnswerA bag contains 8 red and 3 blue counters. Two counters are drawn without replacement. Find the probability of two reds.
Answer