Your answer is wrong (to the problem of, how many 2-digit numbers have the digit of tens strictly smaller than the digit of units)
2 years, 9 months ago
Yes, you are correct. 'My' question has the answer of 36, your question has the answer of 45. My recollection of the exact formulation was wrong (generally I work on these problems in my head, i.e.., without paper, pen or repeated looking on the screen -- so, it's probably bound to happen every now and then...)
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Great answers :)
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If you believe that a practice problem is wrong, you can report it directly and we will take a look at it.
I do not see a question of "how many 2-digit numbers have the digit of tens strictly smaller than the digit of units" in the practice section. The closest question that I see is "How many 2 digit numbers are there, such that the units digit is strictly smaller than the tens digit?". These 2 questions would have different answers.