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Permutation: n Different Things Taken r at a Time

Find the numb...

Question

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

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Solution

First separate the 3 and then arrange the remaining things $^{n - 3} C_{r - 3} (r - 2)! \times 3!$

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Permutation: n Different Things Taken r at a Time

Standard XII Mathematics

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