Question

How many telephone number of 8 digits can be formed if first four digits of telephone number is 9873 and no number can repeat?

Answer 1

Answer:

9873,9837,9378,9387,9738,9783,

8973,8937,8739,8793,8379,8397,

7398,7389,7893,7839,7983,7938,

3789,3798,3897,3879,3978,3987