If N is the number of shafts used, then the total number of feces available for attacking the excavation and construction in tunnels are_________________________?

A. N + 2

B. 2N

C. 2 N + 1

D. 2 N + 2
Be the first to comment if anything wrong with this mcq
Your comment successfully submitted!
It will automatically posted after review and approval by our staff member.