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A local farmer employs a ploughman, a carter, a shepherd and a driver. These four employees have the surnames Ploughman, Carter, Shepherd and Driver; however,...

Six identical pieces of string run through an opaque tube; there is no way to identify which ends form one piece of string. At one...

Six identical pieces of string run through an opaque tube; there is no way to identify which ends form one piece of string. At one...

There 100 people standing in a circle who are numbered 1 to 100 in order, with 1 standing between 100 and 2. Person 1 is...

There 100 people standing in a circle who are numbered 1 to 100 in order, with 1 standing between 100 and 2. Person 1 is...