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Difficulty:
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63% (02:06) correct
37%
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In how many ways can the letters of the word "COMPUTER" be arranged if vowels occupy the even positions?
A. 480
B. 576
C. 720
D. 960
E. 2880
A. 480
B. 576
C. 720
D. 960
E. 2880
28 Jul 2010, 00:12
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jakolik
Hello,
What is the shortest and most systematic way of solving the below question?
In how many ways can the letters of the word "COMPUTER" be arranged if vowels occupy the even positions?
regards,
Jack
What is the shortest and most systematic way of solving the below question?
In how many ways can the letters of the word "COMPUTER" be arranged if vowels occupy the even positions?
regards,
Jack
I think it's meant that vowels can occupy only even positions:
C|O|M|P|U|T|E|R
O|E|O|E|O|E|O|E (O and E stand for odd and even positions respectively).
# of arrangements would be \(C^3_4*3!*5!=4!*5!=2880\).
\(C^3_4\) - choosing which 3 even positions out of 4 will be occupied by vowels (there are 4 even positions: 2nd, 4th, 6th and 8th and only 3 vowels);
\(3!\) - # of different arrangements of these vowels on their even positions;
\(5!\) - # of different arrangements of 8-3=5 other letters left.
Hope it helps.
28 Jul 2010, 00:18
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The word COMPUTER consists of 8 letters of which 3 vowels. All letters are distinc.
First, put 3 vowels into 3 of the positions 2, 4, 6, and 8. There are 4*3*2=24 ways.
Second, once the positions of the 3 vowels are determined, we have to put the 5 other letters into the remaining positions. There are 5*4*3*2*1=120 ways.
Therefore, there are a total of 120*24=2880 ways.
First, put 3 vowels into 3 of the positions 2, 4, 6, and 8. There are 4*3*2=24 ways.
Second, once the positions of the 3 vowels are determined, we have to put the 5 other letters into the remaining positions. There are 5*4*3*2*1=120 ways.
Therefore, there are a total of 120*24=2880 ways.
