3. Nineteen delegates are participating in a round table conference with a host. Two particular delegates always wish to occupy either sides of the host. One particular delegates wants to sit just opposite the host. How many different seating arrangements
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"FIX" the position of the host , then the delegate opposite to him will automatically gets fixed ( so total people are 18). The 2 particular deleg. can be seated around him in 2 ways and the other 16 guest can be seated in 16 ! ways hence required arrangement is 2*16 !
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