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Odd and Even 2 (Posted on 2015-08-03) Difficulty: 2 of 5
Determine the sum of all 3-digit positive integers which contain at least one odd digit and at least one even digit. (For purposes of the problem, zero is an even digit.)

No Solution Yet Submitted by K Sengupta    
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Solution solution | Comment 1 of 4

a.   all 3-digit positive integers   sum up to 494550.

b.  only numbers excluded are 111,222, ...999, summing up to  4995.

с. (added after Ch correction):   b was wrong ,there is a much longer list: 111,113,    ... 662,664...    997,999 ,  summing up to  123775

Answer:  494,550-4995 = 485555    w r o n g !

corrected: 494550 - 123775 = 370775

rem:         Zero is an even digit, even in this problem.


Edited on August 3, 2015, 10:39 am
  Posted by Ady TZIDON on 2015-08-03 08:05:28

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