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
The OA says that its the ratio of 10P5 to 10P4 . I thought that we wererequired to "choose" and not "arrange" in this problem so combination (choosing) seems reasonable no ?
BTW, OA is E
A) 5 to 4
B) 3 to 2
C) 2 to 1
D) 5 to 1
E) 6 to 1
The OA says that its the ratio of 10P5 to 10P4 . I thought that we wererequired to "choose" and not "arrange" in this problem so combination (choosing) seems reasonable no ?
BTW, OA is E
