There was a robbery in which a lot of goods were stolen. The robber(s) left in a truck. It is known that : (1) Nobody else could have been involved other than A, B and C. (2) C never commits a crime without A's participation. (3) B does not know how to drive. So, is A innocent or guilty?
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since " b " doesn't know how to drive so it can't be the robber which means it's either " a " or " c " ... now " c " does not commit a crime without " a " .. which means that if " c " is guilty then " a " is guilty as well .. and if " c " is not .. that leaves " a " only the answer is " a "
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great