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 3-letter code words?	Choose the correct choice from the following answers:
A) 5 to 4  B) 3 to 2  C) 42 to 1  D) 5 to 1  E) 6 to 1
Number of ways to form 5-letter code: 10!/5! = 10*9*8*7*6   Number of ways to form 3-letter code: 10!/7! = 10*9*8   Ratio: 42 to 1   Answer : 42 to 1
<result>C</result>
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 3-letter code words?