A) \[(8,\,2)\]
B) \[(5,\,\,6)\]
C) \[(3,\,\,7)\]
D) \[(8,\,\,3)\]
Correct Answer: A
Solution :
By taking option [a], \[(m,\,n)=(8,\,2)\] Now, \[^{m+n}{{P}_{2}}{{=}^{8+2}}{{P}_{2}}{{=}^{10}}{{P}_{2}}\] \[=\frac{10\,!}{8!}=90\] and \[^{m-n}{{P}_{2}}{{=}^{8-2}}{{P}_{2}}{{=}^{6}}{{P}_{2}}\] \[=\frac{6!}{4!}=30\]You need to login to perform this action.
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