Find how many different numbers can be made from some or all of the digits of the number 1 345 789 if

1. all seven digits are used, the odd digits are all together and no digits are repeated,
2. the numbers made are even numbers between 3000 and 5000, and no digits are repeated,
3. the numbers made are multiples of 5 which are less than 1000, and digits can be repeated.