How many two digit numbers are there in which the tens digit is greater then the ones digit?

How many two digit numbers are there in which the tens digit is greater then the ones digit?
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Answer :

Well, if the tens digit is 1, you have 1 option for the onesdigit; if the tens digit is 2, you have two options for the onesdigit, if the tens digit is 3, you have 3 options for the onesdigit, etc.; up to: if the tens digit is 9, you have 9 options forthe ones digit. Add all that up (1 + 2 + 3 + ... + 9).
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