What Number Completes the Math Pattern?

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SUMMARY

The math pattern discussion centers around replacing the question mark in the sequence 389----21----492, 16...?...10, and 613----5----841. The solution involves calculating the sum of the odd digits in each corner number. For example, the number 492 contains the odd digit 9, resulting in a sum of 9. Following this method, the answer to the missing number is definitively 13.

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Help Please!

What number should replace the question mark?
Tis is driving me crazy. I can't see no pattern.

389----21----492
|...\.../...|
|...\.../...|
|...\.../...|
16...?...10
|.../...\...|
|.../...\...|
|.../...\...|
613----5----841
 

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looks like an extract from a telephone directory to me - but which one?
 
Answer:

Replace the numbers in each of the corners with the sum of the odd digits in the number that is there. For instance in the top right corner is the number 492. There is only one odd digit there, namely 9. So the sum of the odd digits is 9. After replacing all the corner numbers, the pattern appears. For this reason, I guess the answer is 13.
 
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