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Find the number of permutations of n dis...

Find the number of permutations of `n` distinct things taken `r` together, in which 3 particular things must occur together.

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To find the number of permutations of `n` distinct things taken `r` together, where 3 particular things must occur together, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Group of 3 Particular Things**: Since we want the 3 particular things to occur together, we can treat them as a single unit or block. 2. **Count the Remaining Things**: ...
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