anonymous
  • anonymous
I am going to choose 6 students out of the 15 who currently have A's to be mentors for the students who have C's or lower. How many ways can a group of 6 be selected?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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alexwee123
  • alexwee123
|dw:1343977571380:dw|
anonymous
  • anonymous
i have no idea
alexwee123
  • alexwee123
this might help :) |dw:1343977665844:dw|

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anonymous
  • anonymous
i think so how would i aply that
alexwee123
  • alexwee123
for your question n=15 and r=6 so |dw:1343977816649:dw| now can you solve it?
anonymous
  • anonymous
why the !
alexwee123
  • alexwee123
oh it means factorial take "5!" for example 5!=5x4x3x2x1
alexwee123
  • alexwee123
so apply this to the current problem :o
anonymous
  • anonymous
soo whats 15 c x 10
alexwee123
  • alexwee123
what do you think it is?
anonymous
  • anonymous
idk am i multiplying it by the 15
alexwee123
  • alexwee123
answer is 5005...
alexwee123
  • alexwee123
but do you get how i got this?
anonymous
  • anonymous
i want to say yess but i cant
alexwee123
  • alexwee123
ok look :o \[15!=15\times14\times13\times12\times11\times......\times1 \] and\[9!=\times8\times7\times6\times5\times...1 and 6!=6\times5\times4\times3\times2\times1\] so if you sub this in, we can easily simplify the equation \[(15\times14\times13\times12\times11\times10\times9!)\div(6!(9!))\] you can cancel out the 9! and be left w/\[(15\times14\times13\times12\times11\times10)\div(6!)\] then just simplify by using intuition
anonymous
  • anonymous
ohhh ok lol

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