# Thread: Re: Prove that a cube

1. ## Re: Prove that a cube

Prove that a cube Qn includes a number of $\binom{n}{k} \cdot 2^{n-k}$Qk cubes.
(We know that k<=n.)

2. ## Re: Prove that a cube

Originally Posted by taleporos
Prove that a cube Qn includes a number of $\binom{n}{k} \cdot 2^{n-k}$Qk cubes.
(We know that k<=n.)
Please define your terms for those of us who aren't in your course. What does the $n$ mean for a cube? And the $k$? Or aren't you asking about ordinary cubes?

3. ## Re: Prove that a cube

Do you mean that a "Qn" cube has side length n?

4. ## Re: Prove that a cube

Originally Posted by Walagaster
Please define your terms for those of us who aren't in your course. What does the $n$ mean for a cube? And the $k$? Or aren't you asking about ordinary cubes?
Originally Posted by HallsofIvy
Do you mean that a "Qn" cube has side length n?
This is a duplicate of the question here:
Graph Theory Prove Problem (Please help)

This question was originally asked at the end of another user's thread. Realizing the mistake, the user appears to have created a separate thread, and then someone split this post into its own thread.