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How many 2 digit number satisfy the following conditions:
The units digit is smaller than the tens digit :
 one year ago
 one year ago
How many 2 digit number satisfy the following conditions: The units digit is smaller than the tens digit :
 one year ago
 one year ago

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hbaBest ResponseYou've already chosen the best response.0
@experimentX Is C the answer.
 one year ago

experimentXBest ResponseYou've already chosen the best response.1
first and the last
 one year ago

hbaBest ResponseYou've already chosen the best response.0
What about the third one ?
 one year ago

chihiroasleafBest ResponseYou've already chosen the best response.1
I think you should find the possibilities, for example, if the tens digit is 1, so there is only one number, if the tens digit is 2, there are 2 possibilities, and so on...
 one year ago
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