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Question 587287: Find the number of two-digit natural numbers such that the tens digit is greater than the ?units digit.
Answer by htmentor(1343)   (Show Source):
You can put this solution on YOUR website! Find the number of two-digit natural numbers such that the tens digit is greater than the units digit.
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Starting with the tens, only 10 has the tens digit > the units digit
For the twenties, we have 20 and 21 [two numbers]
For the thirties, we have 30, 31 and 32 [three numbers] etc.
So the total is 1+2+3+4+5+6+7+8+9=45 numbers
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