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.

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) (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)
RELATED QUESTIONS
Four-Digit Number. How many four-digit numbers can be formed using the digits 0, 1, 2, 3, (answered by MathLover1,jilalbenkad)

How many 6-digit numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, if... (answered by MathLover1)

How many five-digit numbers can be formed using the digits 0,1,2,3,4,5,6,7,8,&9 if the... (answered by josmiceli)

How many four-digit numbers can be formed using the digits 0,1,2,3,4,5,6,7,8, and 9 if... (answered by ikleyn)

How many three-digit numbers can be formed using the digits 2,3,5,7,8 if the number is... (answered by ikleyn)

How many different two-digit numbers can be formed using the digits 1, 3, 4, and 5.... (answered by stanbon)

How many two-digit numbers can formed if the first digit cannot be 0 and no digit can be... (answered by stanbon)

How many numbers of 5 digits can be formed with the digits 0, 1, 2, 3, 4, 6 & 8 with no... (answered by Edwin McCravy)

How many 6 digit numbers can be formed using 0, 1, 2, 3, 4, 5, 6, 7, 8 and... (answered by Alan3354)