Six people are on an elevator that stops at exactly 6 floors. What is the probability that exactly one person will push the button for each floor?
(A)6!/6^6
(B)6^6/6!
(C)6/6!
(D)6/6^6
(E) 1/6^6
Is the answer A or E
(A)6!/6^6
(B)6^6/6!
(C)6/6!
(D)6/6^6
(E) 1/6^6
Is the answer A or E
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