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

/ Tunnel Engineering / By
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. 2N
B. N + 2
C. 2 N + 1
D. 2 N + 2