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04 Mar 2021, 07:45
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D
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Difficulty:
65%
(hard)
Question Stats:
46% (01:01) correct
54%
(00:58)
wrong
based on 160
sessions
History
Date
Time
Result
Not Attempted Yet
5 boys and 5 girls are to be arranged in two concentric rings, with a girl behind each boy. In how many ways this can be done?
A. 10!
B. 9!
C. 5!*5!
D. 5!*4!
E. 4!*4!
A. 10!
B. 9!
C. 5!*5!
D. 5!*4!
E. 4!*4!
04 Mar 2021, 18:30
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The number of arrangements of n things all taken together in a circle = (n - 1)!
The number of ways of placing 5 boys = (5 - 1)! = 4!
Since the boys are now reference points, the 5 girls can be arranged in 5! ways.
Total number of ways = 4! * 5!
Option D
Arun Kumar
The number of ways of placing 5 boys = (5 - 1)! = 4!
Since the boys are now reference points, the 5 girls can be arranged in 5! ways.
Total number of ways = 4! * 5!
Option D
Arun Kumar
29 Apr 2025, 05:19
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