Sunday, January 28, 2007

"GRE MATH PROBLEM OF THE DAY"

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

at

5 comments:

  1. Vishal NaiduJanuary 28, 2007 at 8:52 PM

    10P5 / 10P4 == 6 / 1
    answer = E

    ReplyDelete
  2. Varun JeeriJanuary 29, 2007 at 8:49 AM

    E

    ReplyDelete
  3. SumaJanuary 30, 2007 at 2:31 AM

    10p5:10p4=6:1

    ReplyDelete
  4. AnonymousJanuary 31, 2007 at 1:40 AM

    E

    ReplyDelete
  5. AdminFebruary 1, 2007 at 11:02 AM

    ways of choosing 5 letters out of 10 is 10C5 but then there are 5! ways to arrange them too… or 10P5. so its basically.
    10P5 : 10P4 :: 6 : 1
    ans. [E]
    PPL PLS TRY TO GIVE EXPLAINATION TOO

    ReplyDelete