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There are 3! ways to arrange the 3 business men in the first row.View attachment 59575
(ii) & (iii) part
The two couples can only sit on the side, which has two seats together (with no aisle between!). So select two pairs of such seats from the 3 and arrange the two couple in those two pairs of seats. This can be done in 3P2 Ways. Now arrange both the couples in their adjacent seats. So the total arrangements for arranging the couples would be: 3P2 * 2! * 2!
There are now only 5 windows seats remaining. So arrange the students in these 5 window seats. The arrangements would be 5!
Hence, the total no. of arrangements for placing these 12 passengers in the seats would be:
3! * 3P2 * 2! * 2! * 5! = 17280 arrangements.