anonymous
  • anonymous
Evaluate 15C2 and 15P2
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
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
anonymous
  • anonymous
15!/2!(15-3)!
anonymous
  • anonymous
almost try that one again.

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anonymous
  • anonymous
15!/2!(15-2)!
anonymous
  • anonymous
hello?
anonymous
  • anonymous
is anyone gonna help
anonymous
  • anonymous
that one is good...now do the permutation one
anonymous
  • anonymous
15!2(15-2)!
anonymous
  • anonymous
have you found the formula for permutations? it's slightly different...but looks almost like combination
anonymous
  • anonymous
no...that's not it permutation is n!/(n-r)!
anonymous
  • anonymous
15/(15-2)
anonymous
  • anonymous
yes...but don't forget the factorials!
anonymous
  • anonymous
ok
anonymous
  • anonymous
so u do 15 times 14 times 13 times 12 times 11 times 10 or?
anonymous
  • anonymous
remember this one:
1 Attachment
anonymous
  • anonymous
the reason i wrote it like that is because i wanted the 10! on the top to cancel with the 10! on the bottom
anonymous
  • anonymous
but this time we don't have 10! on the bottom, instead we have 13!...write it like this:
anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
let me know if that makes sense
anonymous
  • anonymous
so we do 15 times 14 times 13?
anonymous
  • anonymous
correct
anonymous
  • anonymous
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
anonymous
  • anonymous
and thats the answer to the first one?
anonymous
  • anonymous
well, at least multiply it out...what do you get?
anonymous
  • anonymous
2730
anonymous
  • anonymous
after you cancel stuff...multiply and see what number you get
anonymous
  • anonymous
but thats not the answer
anonymous
  • anonymous
what did you get?
anonymous
  • anonymous
2730
anonymous
  • anonymous
on the top
anonymous
  • anonymous
after you cancel you should only have 15*14 left
anonymous
  • anonymous
cause the 13! cancelled with the 13! in the denominator
anonymous
  • anonymous
210
anonymous
  • anonymous
correct...and what's left on the bottom?
anonymous
  • anonymous
it was 105 u made me mess up
anonymous
  • anonymous
^_^ i did? ... well...it was 210 on the top and 2 on the bottom...so you have 210/2 = 105
anonymous
  • anonymous
u never told me that
anonymous
  • anonymous
...of course not...you have to find the answer yourself
anonymous
  • anonymous
now what about the permutation one?
anonymous
  • anonymous
i am gonna post a new one now
anonymous
  • anonymous
because u made me get it wrong
anonymous
  • anonymous
okay...good luck

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