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  1. C

    Another perm and comb question

    Sorry, but where did you get the '4C1' from? Arghh, I hate this topic so much!
  2. C

    Another perm and comb question

    yeah it would be a good idea to avoid using perm button.
  3. C

    Another perm and comb question

    Umm, why does it reduce by 2 each time? Thanks
  4. C

    Another perm and comb question

    Hi, another question: Five couples are to be seated around a dinner table. What is the probability that each member of a couple ends up opposite their partner?
  5. C

    Another perm and comb question

    Consider a pack of 40 cards consisting of the colours red, blue, yellow and green, each with cards numbered 1 to 10. A hand of five cards is dealt from the pack. Find the probabilities that the cards were in ascending order. Thanks
  7. C

    Perms and Comb Q's

    Alrighty thanks... I have another question on this topic... -_-; Don guess, at random, the answers to each of 6 multiple choice questions. IN each question there are 3 alternative answers, only one of which is correct. (i) Find the probability that Don answers exactly two questions correctly...
  8. C

    Perms and Comb Q's

    Ahh okay... That kinda explains it. Was what I said before correct? ie. that there are 10C6 ways to arrange 10 people in 6 ways in 5! ways... and that the remaining 4 people can be arranged in 4C4=1 way in 3! ways. Thanks
  9. C

    Perms and Comb Q's

    Thanks for your replies. Hmm, if I understand correctly you're arranging 10C6 people for the table that can seat 6 people, so the remaining people are 4 people, which can be seated in 4C4 ways. Sorry to sound so dumb, but why do we need to do that? Why can't we just do 5!*4! ? Thanks again.
  10. C

    Perms and Comb Q's

    Where'd you get the 10C6 and 4C4 from?
  11. C

    Perms and Comb Q's

    (iii) Hi, I did (3C2 * 5C2)/(12C2) for that, which is 5/11. Is that somewhat correct, or completely wrong? Thanks
  13. C

    Abbreviate Cricle Geometry prooofs

    Wasn't there something about this that they DIDN'T allow abbreviations for one year?
  14. C

    Perms and Comb Q's

    1) There are 12 videotapes arranged ina row on a shelf in a video shop. THere are 3 identical copies of 'Gone in with the wind', 4 of 'Tootsie' and 5 of 'Gladiator'. (i) How many different arrangements are there? (ii) How manu different arragements are there if the videos with the same...
  15. C

    What's ur MSN

    What's ur MSN
  16. C

    Arrangement in a circle

    Ahh yes, thank you :)
  17. C

    Arrangement in a circle

    Thanks, but why do you divide by 3 there?
  19. C

    Arrangement in a circle

    Answer is 12... =\
  20. C

    Arrangement in a circle

    Three men and three women are to be seated at a round table. How many seating arrangements are possible if each of the men is to have a woman seated either side of them? An explanation would also be great. Thanks
  21. C

    Perms

    How'd ya do that?
  22. C

    Perms

    The letters of the word CALCULUS are arranged in a row (i) How many different arrangements are possible? (I can do this) = 5040 (ii) If one of these arrangements is selected at random, what is the probability that it begins with 'U' and ends in 'U'? I can do (ii) using 2U level probability (ie...
  23. C

    The best maths book for 2unit+3unit [poll]

    Learn how to spell it :mad1: Well the original author is dead.
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