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17 Sep 2016, 04:05
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
29% (00:59) correct
71%
(01:02)
wrong
based on 312
sessions
History
Date
Time
Result
Not Attempted Yet
In how many ways can 4 rings be arranged in 5 finger (no finger has more than 1 ring)?
A. 5C4
B. 5P4
C. (5C4)4!
D. B and C
E. Something else ( a non traditional GMAT option)
This is a self made question to understand the concept. Please excuse if the question is incorrect. I understand that this is probably sub 200 level question. Let me know your thoughts on my approach(in spoilers)
A. 5C4
B. 5P4
C. (5C4)4!
D. B and C
E. Something else ( a non traditional GMAT option)
This is a self made question to understand the concept. Please excuse if the question is incorrect. I understand that this is probably sub 200 level question. Let me know your thoughts on my approach(in spoilers)
My approach:
No. of ways of selecting 4 fingers from 5(considering a non-mutant) = 5C4.
No. of ways of arranging the 4 rings= 4!
Answer: 5C4.4!
No. of ways of selecting 4 fingers from 5(considering a non-mutant) = 5C4.
No. of ways of arranging the 4 rings= 4!
Answer: 5C4.4!
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17 Sep 2016, 04:15
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hdwnkr
Your approach of solving this question is correct. There is no issue in it. Also, please note that 5C4 * 4! = 5P4. Hence, answer is B and C.
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17 Sep 2016, 07:44
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dash problem method
_ _ _ _ _
4 3 2 1 = 24
one will always be blank
so 24*5 = 120
hence 5c4 * 4!
_ _ _ _ _
4 3 2 1 = 24
one will always be blank
so 24*5 = 120
hence 5c4 * 4!
