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In how many ways five different rings can be put on four fingers with at least one ring on each finger?A. 120B. 480C. 240D. 960 |
Answer» Since at least one ring is to be put in each finger. So, we select four rings out of 5 and then they are arranged in fingers. This can be done in `""^(5)C_(4)xx4!` ways. Now, either above the ring already placed on it or below it. So, the required number of ways `=""^(5)C_(4)xx4!xx4xx2=960` |
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