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In how many ways five different rings can be worn in four fingers with at least one ring in each finger?A. 120B. 96C. 20D. 480 |
Answer» Since at least one ring is to be worn in each finger. So, we first select four rings out of 5 given rings and then they are arranged in fingers. This can be done in `""^(5)C_(4)xx4!` ways. Now, one ring is left which can be worn in any one of the four fingers in 4 ways. Hence, required number of ways `=""^(5)C_(4)xx4!xx4=480`. |
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