Use the fundamental principle of counting or permutations to solve the problem.

How many 7-digit telephone numbers are possible if the first digit cannot be 0 and the following conditions apply?

(a) Only odd digits may be used.

(b) The telephone number must be a multiple of 10 (that is, it must end in 0).

(c) The telephone number must be a multiple of 100.

(d) The first 3 digits are 481.

(e) No repetitions are allowed.