Please answer all of the questions ASAP (within 10 minutes). I will thumbs up/rate if it's correct. Please it's urgent.

These are mathematical analyses for computer science problems-

6. k=0 Deduce the value of 2.(4) b) Find the value of L?_) (-1) c) Ten people are sitting in circle, and every mperson is executed. Prove that, for every k> 1, the first second, and third person executed cannot be 10, k, and k +1, in this kao order