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Find the number of permutations of n distinct things taken r together, in which 3 particular things must occur together.
Answers (1)
Combination of n things taken r at a time in which 3 things always occur together=
3 things taken together is considered 1 group Number of arrangement of 3 things=
Now, number of arrangement of r-2 objects=
Total number of arrangements=
View full answer
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