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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 | |
A. | 2N [Wrong Answer] |
B. | N + 2 [Wrong Answer] |
C. | 2 N + 1 [Wrong Answer] |
D. | 2 N + 2 [Correct Answer] |
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