A) 6
B) 5
C) 4
D) 7
Correct Answer: A
Solution :
\[^{n}{{P}_{r}}\,=720.{{\,}^{n}}{{C}_{r}}\] Þ \[^{n}{{P}_{r}}\,\div {{\,}^{n}}{{C}_{r}}\,=720\] Þ \[\,r\,!=720=6\,!\] Þ r = 6.
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