A) \[{}^{4}{{P}_{4}}\]
B) \[{}^{4}{{P}_{3}}\]
C) \[{}^{4}{{P}_{1}}+{}^{4}{{P}_{2}}+{}^{4}{{P}_{3}}\]
D) \[{}^{4}{{P}_{1}}+{}^{4}{{P}_{2}}+{}^{4}{{P}_{3}}+{}^{4}{{P}_{4}}\]
E) None of these
Correct Answer: D
Solution :
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