3. What formula is used to determine the number of arrangements of objects in a circle? A. $n!$ B. $\frac{n!}{(n-r)!}$ C. $(n-1)!$ D. $(n-r)!$ 4. If $_nP_5 = 6720$, what is the value of $n$? A. 5 B. 6 C. 7 D. 8 5. A family is being arranged in a line for a group
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In this case, the number of arrangements is given as 6720. So we have (n-1)! = 6720. Show more…
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