Match'n
Probability
Level
pending
(TIMO) There are 4 balls with labels A, B, C, D respectively and there are 4 pockets with labels A, B, C, D respectively. A ball is put into each pocket randomly. Find the number of way(s) in which exactly 1 ball have a label matching the label of its pocket.
The answer is 8.
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1 solution
ACDB,ADBC,CBDA,DBAC,BDCA,DACB,BCAD,CABD ,so there are 8 ways.