Subject: discrete structure

A. Suppose that there are 7 air routes to travel from Turkey to Italy and 5 from Italy to Malaysia. i. How many ways are there to plan a trip route from Turkey to Malaysia? ii. How many ways are there to plan a trip route for round-trip form Turkey to Malaysia via Italy? iii. How many ways are there to plan a trip route for round-trip form Turkey to Malaysia via Italy, without using a route more than once? B. How many strings of six letters are there, using the English letters? i. If letters can be repeated? If starting and ending letters are same and letters can't be repeated? iii. If it starts with O and letters can be repeated? iv. If the letter X is at each even position and no letters can be repeated? If either starts with letter X or end with letter Y and the letters can be repeated? ii. V