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Any Good Mathematicians Here???

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  • treszoks
    replied
    Originally posted by 0ptima
    Hey treszoks, wanna write my discreet math exam? Ive been doig Perms and Combs all day....
    As tempting as that sounds, no

    Leave a comment:


  • 0ptima
    replied
    Hey treszoks, wanna write my discreet math exam? Ive been doig Perms and Combs all day....

    Leave a comment:


  • Cloud Strife
    replied
    Ha ha ha...
    Thats a nice formula... Yes I was looking for something like that cheers *Takes out his dusty steam driven calculator* only joking it can hadle factorials



    Cloud

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  • treszoks
    replied
    Here's the formula and you can figure it out yourself

    C(n,k) = n! / (k! * (n-k)!)

    where:
    n is the number of total balls you're picking from
    k is the number of balls you actually choose

    For example, to determine the odds of picking all 6 numbers correctly in a 6 number drawing of 50 balls:

    C(n,k) => C(50,6) = (50!) / (6! * (50-6)!) = 15,890,700 (1 in 15,890,700 that is)

    To determine if you got a subset of the 6 numbers correctly from the 50 total balls, it's a little more complicated:

    C(n,k) / [ C(k,m) * C(n-k,k-m) ]

    where:
    n = number of balls (50 in this case)
    k = number of balls to choose (6 in this case)
    m = number of balls correctly picked (1,2,3,4,5, or 6)

    For example, to determine the odds of picking 5 of the 6 numbers correctly in a 6 number drawing of 50 balls:

    C(50,6) / [ C(6,5) * C(50-6,6-5) ] = 15,890,700 / [ 6 * 44] = 60,192 (1 in 60,192)

    Yes I'm bored.

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  • Cloud Strife
    replied
    umm who ever choses the correct balls or something like that :-)

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  • BillaBongUSA
    replied
    How do you determine who wins first prize, second prize, etc.?

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  • Cloud Strife
    replied
    Originally posted by okrogius
    How many do you expect to enter?
    I dont know... maybe about 300 -400 ... But im not sure

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  • okrogius
    replied
    How many do you expect to enter?

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  • Cloud Strife
    started a topic Any Good Mathematicians Here???

    Any Good Mathematicians Here???

    Im working on a lottery system for my board... Just for its birthday :-)

    We are having 5 prizes...

    I need someone to work out how many balls out of a selecion of ??? balls would be needed to have a good probability that this will be the likely outcome... :-

    1st Prize) 1 winner
    2nd Prize) 3 winners
    3rd Prize) 8 winners
    4th prize) 10 winners
    5th prize) 17 winners

    The number of winners can be slightly changed... We have 1104 members and there are usually 20 members online 30 max but I think there will be alot more on board for the boards birthday

    He he I was never any good at maths

    Cloud
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