solution, please

6- The Canadian postal code system consists of six characters where the rst, third, and fth characters are letters and the other characters are digits. If no postal code in Canada can begin with the letters D, F, I, O, Q, U, but repeated letters are allowed and any digit is allowed. How many postal codes are possible in Canada? Thinking: 7- How many 5 digit even numbers can be made from the number 3 146 237, with repeated numbers allowed 3- A man bought two vanilla ice cream cones, three chocolate cones, four strawberry cones, and one pistachio cone for his ten children. In how many ways can he distribute the avours among the children? 9- a- In how many ways can the letters of the word CANADA be arranged? b- How many seven digit numbers are there which include two 3's, three 2's, and two 8'5? 10- How many different arrangements of 12 people are there if less and Rob must be together? 1 1- How many ways are there to arrange the letters of the word FRIEND if the vowels must be apart