Homework Help: math

Posted by tanzima on Wednesday, April 11, 2012 at 8:57pm.

find the number of two digit natural numbers such that the tens digit is greater than the units digit.

math - Steve, Thursday, April 12, 2012 at 12:22am
20 21
30 31 32
...
90 91 92 ... 98

2+3+...+9

= 44

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