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If a code word is defined to be a sequence of different [#permalink]
14 Apr 2008, 12:09
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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
Would someone please show me how to solve this problem? thanks