the number of arrangement of 10 different things taken 4 at a time in which one particular thing always occur
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Out of 10 different things one thing never occur then 4 things will be occur out of 9 things. Therefore, 9p4=(9!)/(9-4)! thank you!! Hence the number of permutations of 10 different things taken 4 at a time in which one particular thing never occurs is 3024 .
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