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anonymous

  • one year ago

Need Help! Its a combination problem.5

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  1. FireKat97
    • one year ago
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    I don't think your factorial equation is right... follow this format \[\frac{ n! }{ k! (n-k)! }\] and try simplifying now

  2. anonymous
    • one year ago
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    15! / 15! (5-15)!

  3. anonymous
    • one year ago
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    On my notes it says nCk = n!/(n-k)! k! so id rather do it that way :) but it would still be the same way right?

  4. FireKat97
    • one year ago
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    Wait actually

  5. anonymous
    • one year ago
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    I wrote the wrong number.. I just need to figure out how to simplify 15C5

  6. anonymous
    • one year ago
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    its supposed to be 3003 but idk how? I can do it from a calculator, but on a quiz i need to be able to show my work

  7. FireKat97
    • one year ago
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    You would get 15!/ 15!. -10! that way and I don't think you should have a negative factorial

  8. anonymous
    • one year ago
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    I got 15!/10! 5!

  9. FireKat97
    • one year ago
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    yup thats right

  10. anonymous
    • one year ago
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    |dw:1442908599294:dw|

  11. anonymous
    • one year ago
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    The way i simplified it was 15 14 13 12 11 10 _________________________ 10 5 4 3 2 1 I crossed out the 10's and then from there it doesnt seem right, but its the way my teacher taught us. so for ex, 5 *3 = 15 7*2 = 14

  12. anonymous
    • one year ago
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    so then 3 would go on top of the 15 and the 7 would go on top of the 14

  13. FireKat97
    • one year ago
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    yeah I did the same, then you can cancel a few other things out as well

  14. FireKat97
    • one year ago
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    yup seems right so far

  15. anonymous
    • one year ago
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    thats where im stuck because i cant get 3003 if i do then it would be 3 * 7 * 11 *13 but what happens to the 12?

  16. FireKat97
    • one year ago
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    so answer is 3003 right?

  17. anonymous
    • one year ago
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    yes

  18. FireKat97
    • one year ago
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    okay so you have \[\frac{ 15 . 14. 13. 12. 11 }{ 5. 4. 3. 2. 1}\]

  19. anonymous
    • one year ago
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    yes

  20. FireKat97
    • one year ago
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    |dw:1442908920946:dw|

  21. FireKat97
    • one year ago
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    do you follow what I did there?

  22. anonymous
    • one year ago
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    is that a 4?

  23. anonymous
    • one year ago
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    above the 12?

  24. FireKat97
    • one year ago
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    yea

  25. anonymous
    • one year ago
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    okay yeah i understand so far

  26. FireKat97
    • one year ago
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    and it cancels with the 4 below

  27. FireKat97
    • one year ago
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    yup so now we have left 3 x 7 x 13 x 11

  28. anonymous
    • one year ago
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    OHH LOL OKAY I GET IT NOW ! AHHHH okay i was doing it right then

  29. FireKat97
    • one year ago
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    yup you were right all along ahahahha :D

  30. anonymous
    • one year ago
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    wait what happend to the 3? Lol

  31. FireKat97
    • one year ago
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    the bottom one got cancelled to make the 12 on top into a 4

  32. anonymous
    • one year ago
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    ooookay yay! thanks :)

  33. FireKat97
    • one year ago
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    haha no problem :)

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