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The average is 10. You will find that the average when adding together the first n odd numbers is always equal to n.
The sum of any two consecutive whole numbers must be odd. 158 is not odd. Therefore the question has no valid answer.
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This depends on what "x" is. The sum of the first x odd numbers is equal to x^2 or x*x.
No odd whole numbers have 12 as a factor. 1 and 3 are odd numbers that are factors of 12.