Two ordering constraints at once
The letters A, B, C, D, E are arranged in a uniformly random order. What is the probability that A appears before B and D appears before E? Give a decimal to four places.
Show hints (2)+
- Each pair's order is 50-50 by symmetry - value them separately.
- The pairs share no letters, so the two events are independent: multiply.
Answer
Reveal answer →Final answer
0.25
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