What is 10C3?

Question

This is Combination notation, but without the subscripts.) Even if the number is >= 1000, do NOT type commas.

Answer 1

 

Hi Caleb,

 

The comnibation nCr can be calculated as follows.

 

     _nC_r = n!/[(n-r)!r!].

 

So,

 

     ₁₀C₃ = 10!/[(10-3)!·3!]

 

            = 10!/(7!·3!)

 

            = 10·9·8/(3·2·1)

 

            = 120