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.)

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: Z**ero is an **even** digit, **even** in this problem.

*Edited on ***August 3, 2015, 10:39 am**