Connection of cities

Probability Level 1

Five cities P,Q,R,S,TP,Q,R,S,T are connected by different modes of transport as follows

  • PP and QQ connected by boat as well as rail.
  • SS and RR connected by bus and boat.
  • QQ and TT connected by air only.
  • PP and RR connected by boat only.
  • TT and RR connected by rail and bus.

If a person visits each of the places starting from PP and gets back to P,P, which of the following places must he visit twice?

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