SOLUTION: How many 4 digit numbers can be formed from the digits 0-9
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Question 1177880: How many 4 digit numbers can be formed from the digits 0-9
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
if repetitions are allowed,
Two ways to get the answer:
1. There are integers starting with and ending with .
But the integers starting with and ending with have less than digits,
so the desired number is or ways.
2.
there is total of digits from to
so, there is ways to choose each ones, tens, hundredths, and thousands'
that is
since cannot be in place of thousands', only ones, tens, hundredths which is three digit numbers , deduct it
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