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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?
 one year ago
 one year ago
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?
 one year ago
 one year ago

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alexwee123Best ResponseYou've already chosen the best response.1
dw:1343977571380:dw
 one year ago

alexwee123Best ResponseYou've already chosen the best response.1
this might help :) dw:1343977665844:dw
 one year ago

katiebuggBest ResponseYou've already chosen the best response.0
i think so how would i aply that
 one year ago

alexwee123Best ResponseYou've already chosen the best response.1
for your question n=15 and r=6 so dw:1343977816649:dw now can you solve it?
 one year ago

alexwee123Best ResponseYou've already chosen the best response.1
oh it means factorial take "5!" for example 5!=5x4x3x2x1
 one year ago

alexwee123Best ResponseYou've already chosen the best response.1
so apply this to the current problem :o
 one year ago

alexwee123Best ResponseYou've already chosen the best response.1
what do you think it is?
 one year ago

katiebuggBest ResponseYou've already chosen the best response.0
idk am i multiplying it by the 15
 one year ago

alexwee123Best ResponseYou've already chosen the best response.1
but do you get how i got this?
 one year ago

katiebuggBest ResponseYou've already chosen the best response.0
i want to say yess but i cant
 one year ago

alexwee123Best ResponseYou've already chosen the best response.1
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
 one year ago
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