Multiple choice

Consider the following two problems on undirected graphs $\alpha$: Given G(V,E), does G have an independent set of size |V |− 4? $\beta$: Given G(V,E), does G have an independent set of size 5?

Which one of the following is true?

  1. $\alpha$ is in the P and $\beta$ is NP-complete
  2. $\alpha$ is NP-complete and $\beta$ is P
  3. Both $\alpha$ and $\beta$ are NP-complete
  4. Both $\alpha$ and $\beta$ are in P
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Graph independent set decision problem is NP Complete.