SOLUTION: Four-Digit Number. How many four-digit numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 if the first digit cannot be 0? Repeated digits are allowed.

Question 413523: Four-Digit Number. How many four-digit numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 if the first digit cannot be 0? Repeated digits are allowed.

Found 2 solutions by MathLover1, jilalbenkad:
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!
choices for first digit (the first digit cannot be 0) and choices for remaining three digits

Answer by jilalbenkad(2) (Show Source): You can put this solution on YOUR website!
9*(10)^3= 9000
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