How many passwords of 8 character can be made using the list of character {2,5,7,A, B,C, M,Z}, so that (repetition not allowed)
i) it always starts with either ‘2’ or ‘Z’ or ‘M’ and ends with a number
ii) never ends with ‘B’ and starts with a alphabet

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?