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how many integers between 100 and 150 have three different digits in increasing order? (for example, 129, 158, etc.)

 Jan 19, 2020
edited by atlas9  Jan 19, 2020
 #1
avatar+20254 
+4

123 -    4 5 6  7 8  9

134  -   5 6 7 8 9

145  -   6 7 8  9

 Jan 19, 2020

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