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27 Mar 2017, 04:58
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
84% (00:47) correct
16%
(01:09)
wrong
based on 112
sessions
History
Date
Time
Result
Not Attempted Yet
Five red bottles and one blue bottle are to be arranged in a straight line from left to right on a windowsill. How many different unique color arrangements are possible?
A. 120
B. 60
C. 30
D. 12
E. 6
A. 120
B. 60
C. 30
D. 12
E. 6
27 Mar 2017, 06:33
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Bunuel
_R_R_R_R_R_ - Let R denote red bottles, the blue bottle can fill up one of the 6 spaces. So 6 ways.
Note: If the red bottles were unique, the total ways of arrangement would be 6! = 720, which is not in the option. So it's safe to assume the red bottles are identical.
Cheers!
27 Mar 2017, 06:42
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There is no mention of the red bottles being unique so we must assume that they are identical. There are 6 ways that the bottles can be arranged. Answer choice "E".
B-R-R-R-R-R
R-B-R-R-R-R
R-R-B-R-R-R
R-R-R-B-R-R
R-R-R-R-B-R
R-R-R-R-R-B
B-R-R-R-R-R
R-B-R-R-R-R
R-R-B-R-R-R
R-R-R-B-R-R
R-R-R-R-B-R
R-R-R-R-R-B
