Thank you for the opportunity to help you with your question!
Sorry for the previous question I had not seen your reply. Please do not be hasty to withdraw infuture.
To solve such problems you use combinations
.The question is not complete I need to know the possible number of flight times. Please include that.
Sorry I have seen it
3 different flights indicates the times
DIRECT FLIGHT AND TIME OR INDIRECT FLIGHT AND TIME
1C1 *3C1 +3C1*3C1
3+9 = 12
Part 2 will be 4C1* 3C1 = 4*3 =12
Ask me the previous question directly
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