Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions


This problem involves combination.
Using the formula for combination as:
_nC_r =  \frac{n!}{(n-r)!r!}
_6C_3 =  \frac{6!}{(6-3)!3!}
_6C_3 =  \frac{6(5)(4)(3)(2)(1)}{(3(2)(1))(3(2)(1))}
_6C_3 = 20
therefore there are 20 ways to which a student can select 3 books.
0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts