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 end of the tube tie three knots, each knot joining two of the pieces of string.
Then tie three knots at the other end of the tube, again each knot joins two pieces of string.
What is the probability that you have made one continuous loop from the six pieces of string?
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Answer at 9.00 on Monday