Futurama!
Probability
Level
3
How many moves will it take to switch the 4 letters of BACD around to get ABCD without swapping the same 2 letters more than once (if you switch the letters A and D, you cannot switch them back)?
Note: Assume A and B have already been switched.
The answer is 5.
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1 solution
abter AB
CD BC AD AC BD