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In how many ways can a room be entered and exited from the 3
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08 May 2019, 04:25
08 May 2019, 04:25
1
Expert Reply
00:00
Question Stats:
56% (00:24) correct
43% (00:16) wrong based on 32 sessions
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In how many ways can a room be entered and exited from the 3 doors to the room?
(A) 1
(B) 3
(C) 6
(D) 9
(E) 12
(A) 1
(B) 3
(C) 6
(D) 9
(E) 12
Re: In how many ways can a room be entered and exited from the 3
[#permalink]
31 Aug 2019, 02:51
31 Aug 2019, 02:51
1
Shouldn't the answer be D?
Re: In how many ways can a room be entered and exited from the 3
[#permalink]
31 Aug 2019, 02:57
31 Aug 2019, 02:57
Expert Reply
The problem type is “no indistinguishable objects and repetitions allowed”. Actually a permutation without any restriction
You can enter and exit from whatever door you wanna.
\(n^r = 3^2 = 9\)
C
You can enter and exit from whatever door you wanna.
\(n^r = 3^2 = 9\)
C
