252
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5
1010111 1111100 1011101 and many more
Six of them.
There are 5 numbers which can make the 3 digit numbers in this example. Therefore each digit in the 3 digit number has 5 choices of which number can be placed there. Therefore number of 3 digit numbers = 5 x 5 x 5 = 125
The number 500 contains the digit 5 one time, specifically in the hundreds place. Therefore, there is one occurrence of the digit 5 in the number 500.