There are 90,000 different number combinations that can be made in a fivedigit number if numbers can repeat. To determine the number of possibilities, each place digit has to be evaluated independently to see how many numbers could fit there and then all are multiplied together.
A fivedigit number has five different place settings which can take on various values. The first digit can take on nine values, from 1 to 9. For the second through fifth digits any number between 0 and 9 can be used. To find the total number of combinations, these values are then multiplied together: 9 x 10 x 10 x 10 x 10 = 90,000 total combinations.
If repeated numbers are permitted the answer is 8x8x8x8x8= 32768. (85) If the numbers can only be used once in each combination, the answer is 8x7x6x5x4= 6720. where ABCDE has [n.
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A number is not digits. You could ask how many digits are needed to represent a certain number in base ten, but the question "How many digits is this number?" does not make
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Since all normal digits are used, there are 10000
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10
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