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anonymous

  • 5 years ago

Evaluate 15C2 and 15P2

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  1. anonymous
    • 5 years ago
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    well...we did a similar one earlier no? 15c2 you can do just like we did earlier...for 15p2 the formula is different...i'm sure your book has it...please look it up...if you can't find it i'll show you...but u need ot try to find it first

  2. anonymous
    • 5 years ago
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    15!/2!(15-3)!

  3. anonymous
    • 5 years ago
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    almost try that one again.

  4. anonymous
    • 5 years ago
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    15!/2!(15-2)!

  5. anonymous
    • 5 years ago
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    hello?

  6. anonymous
    • 5 years ago
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    is anyone gonna help

  7. anonymous
    • 5 years ago
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    that one is good...now do the permutation one

  8. anonymous
    • 5 years ago
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    15!2(15-2)!

  9. anonymous
    • 5 years ago
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    have you found the formula for permutations? it's slightly different...but looks almost like combination

  10. anonymous
    • 5 years ago
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    no...that's not it permutation is n!/(n-r)!

  11. anonymous
    • 5 years ago
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    15/(15-2)

  12. anonymous
    • 5 years ago
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    yes...but don't forget the factorials!

  13. anonymous
    • 5 years ago
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    ok

  14. anonymous
    • 5 years ago
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    so u do 15 times 14 times 13 times 12 times 11 times 10 or?

  15. anonymous
    • 5 years ago
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    remember this one:

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  16. anonymous
    • 5 years ago
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    the reason i wrote it like that is because i wanted the 10! on the top to cancel with the 10! on the bottom

  17. anonymous
    • 5 years ago
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    but this time we don't have 10! on the bottom, instead we have 13!...write it like this:

  18. anonymous
    • 5 years ago
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  19. anonymous
    • 5 years ago
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    let me know if that makes sense

  20. anonymous
    • 5 years ago
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    so we do 15 times 14 times 13?

  21. anonymous
    • 5 years ago
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    correct

  22. anonymous
    • 5 years ago
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    try to be clever with the way you write it, so that you can cancel as much as possible...technically you can just multiply EVERYTHING. but that will give you HUGE numbers...better to cancel...so we make our lives easier

  23. anonymous
    • 5 years ago
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    and thats the answer to the first one?

  24. anonymous
    • 5 years ago
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    well, at least multiply it out...what do you get?

  25. anonymous
    • 5 years ago
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    2730

  26. anonymous
    • 5 years ago
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    after you cancel stuff...multiply and see what number you get

  27. anonymous
    • 5 years ago
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    but thats not the answer

  28. anonymous
    • 5 years ago
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    what did you get?

  29. anonymous
    • 5 years ago
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    2730

  30. anonymous
    • 5 years ago
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    on the top

  31. anonymous
    • 5 years ago
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    after you cancel you should only have 15*14 left

  32. anonymous
    • 5 years ago
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    cause the 13! cancelled with the 13! in the denominator

  33. anonymous
    • 5 years ago
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    210

  34. anonymous
    • 5 years ago
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    correct...and what's left on the bottom?

  35. anonymous
    • 5 years ago
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    it was 105 u made me mess up

  36. anonymous
    • 5 years ago
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    ^_^ i did? ... well...it was 210 on the top and 2 on the bottom...so you have 210/2 = 105

  37. anonymous
    • 5 years ago
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    u never told me that

  38. anonymous
    • 5 years ago
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    ...of course not...you have to find the answer yourself

  39. anonymous
    • 5 years ago
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    now what about the permutation one?

  40. anonymous
    • 5 years ago
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    i am gonna post a new one now

  41. anonymous
    • 5 years ago
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    because u made me get it wrong

  42. anonymous
    • 5 years ago
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    okay...good luck

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