Others Maths Puzzle

tell me the ratio of 3/4. ????

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Others Other Question

Five Persons namely,Yasin,Rasheed,Ali and Rehman are to be seated in five out of the six seats numbered from 1 to 6. The following table provides information about the serial numbers of the seats (given in the table under their name) on which each of the mentioned friends can possibly sit.
Names Yasir Arafat
Seat No 1 2 or 3
Rasheed Ali
2,3 or 4 4 or 5
Rehman
5 or 6
If one of the seats numbered 2 or 4 is unoccupied, then the number of different ways five mentioned persons can be seated is
tell me the ratio of 3/4.?????