SOLUTION: How many 7-digit numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6, 7, and 8 if the first digit cannot be 0? Repeated digits are allowed.

Algebra ->  Permutations -> SOLUTION: How many 7-digit numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6, 7, and 8 if the first digit cannot be 0? Repeated digits are allowed.      Log On


   

Question 544519: How many 7-digit numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6, 7, and 8 if the first digit cannot be 0? Repeated digits are allowed.
Answer by hitarth(1) About Me  (Show Source):
You can put this solution on YOUR website!
it will be 7!
for 8 digit, (with repetition) the digits given to us to form number will be:-
1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4.......,8,8,8,8,8,8,8,8
the numbers formed will be permutation of 64 object to arrange in eight places.
example 64!/{64-8}! = (64*63*62*61*60*59*58*57)