Please explain how you would solve these questions. I try them but my answer are wrong.

Assignment 1.2: Permutations and Combinations (continued) 6. In how many different ways can person A walk to person B, passing through street intersection C, if the trip takes exactly 15 blocks? (3 marks) B C 7. Lotto 6-49 is a lottery in which a person selects six different numbers from 1 to 49. The order that the numbers are selected does not matter. How many ways can a selection be made? (1 mark) 8. On a Grade 12 Mathematics examination, students must answer exactly five of the first six questions and three out of the last five questions. In how many ways can this be done? (2 marks)5. In how many ways can the letters of the word MAXIMUM be arranged if the three Ms must be together? Explain your process. (2 marks)Assignment 1.2: Permutations and Combinations (continued) 9. Using the digits 2, 2, 2, 3, 3, 4, 5, how many a) seven-digit numbers can be formed? (2 marks) b) seven-digit numbers can be formed if the number is greater than 3,400,000? (5 marks) c) seven-digit numbers can be formed if the number is even