Recent content by Elruso

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    Combinations! How many letter combinations can you make with 9 letters?

    So iit´s C(9,2)*C(7,2)*C(5,2)*3*2*1? In my math book the answer is C(9,2)*C(7,2)*5!... which i find a little strange.
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    Combinations! How many letter combinations can you make with 9 letters?

    Combinations! How many... Homework Statement How many letter combinations with 9 letters are you able to make with following letters : M-A-T-E-M-A-T-I-K? Homework Equations Well its pretty obvious you need to use Combinations. Please explain how you solve this problem, don't write...
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    Proving Pascal's Formula for Combinations: Using Pascal's Triangle and Formula

    Well, n=1,2,3,4... and k=1,2,3,4...
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    Proving Pascal's Formula for Combinations: Using Pascal's Triangle and Formula

    Prove "Pascals formula" Homework Statement Show that (k)+(k+1)+...+(n) = (n+1) it's supposed to be combinations (k) (k ) (k) (k+1) That's the question in my math book. I guess you need to use Pascals triangle and Pascals formula but unfortionately I don't know how to...
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    Modulus Operations Homework: Simplifying 1^3+2^3+3^3+...+99^3+100^3(mod4)

    Homework Statement How do you simplify : 1^3+2^3+3^3+4^3+...+99^3+100^3(mod4) Please try to explain the solution as detailed as possible or atleast so I can understand it. :smile:
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