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Q: How many numbers between 10 and 99 have 2 different digits?
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How many digits between 1 and 1128?

There are 6484 digits BETWEEN the two given numbers.


How many different whole numbers between 0 and 1000 have digits whose sum is 9?

999 are whole.


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How many such pairs of digits are there in number 36725918 each of which has as many digits between them in the number as when the digits are arranged in descending order within the numbers?

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How many 4 digit numbers can be formed from digits 123456789?

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How many digits are there between 31 and 400?

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How many four digits numbers can be formed using 0578?

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