A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing
 2 years 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?
 2 years 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?

This Question is Closed

alexwee123
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1343977571380:dw

alexwee123
 2 years ago
Best ResponseYou've already chosen the best response.1this might help :) dw:1343977665844:dw

katiebugg
 2 years ago
Best ResponseYou've already chosen the best response.0i think so how would i aply that

alexwee123
 2 years ago
Best ResponseYou've already chosen the best response.1for your question n=15 and r=6 so dw:1343977816649:dw now can you solve it?

alexwee123
 2 years ago
Best ResponseYou've already chosen the best response.1oh it means factorial take "5!" for example 5!=5x4x3x2x1

alexwee123
 2 years ago
Best ResponseYou've already chosen the best response.1so apply this to the current problem :o

alexwee123
 2 years ago
Best ResponseYou've already chosen the best response.1what do you think it is?

katiebugg
 2 years ago
Best ResponseYou've already chosen the best response.0idk am i multiplying it by the 15

alexwee123
 2 years ago
Best ResponseYou've already chosen the best response.1but do you get how i got this?

katiebugg
 2 years ago
Best ResponseYou've already chosen the best response.0i want to say yess but i cant

alexwee123
 2 years ago
Best ResponseYou've already chosen the best response.1ok 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
Ask your own question
Ask a QuestionFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.