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set 23 Q 14

by radhika1306 » Fri Aug 31, 2007 5:04 pm
If a code word is defined to be a sequence of different letters chosen from the 10 letters
A, B, C, D, E, F, G, H, I, and J, what is the ratio of the number of 5-letter code words to
the number of 4-letter code words?
A. 5 to 4
B. 3 to 2
C. 2 to 1
D. 5 to 1
E. 6 to 1
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by keepsmilinyaar » Sat Sep 01, 2007 12:18 am
The number of 5 Letter coded words will be = 10*9*8*7*6
The number of 4 Letter coded words will be = 10*9*8*7

Therefore the ratio of 5 letter to 4 letter words will be = 6 : 1

Is the answer E?
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by mtg123 » Sat Sep 01, 2007 6:32 am
The number of five letter words = 10P5 = 10!/5!
The number of five letter words = 10P4 = 10!/4!

So the ratio is 6:1
The answer is E
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by mtg123 » Sat Sep 01, 2007 6:33 am
The number of five letter words = 10P5 = 10!/5!
The number of five letter words = 10P4 = 10!/4!

So the ratio is 6:1
The answer is E
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