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When x is an integer, 2x - 1 will always be an odd number, regardless of the value of x; what is the proof?

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It is essential to be exact in math. If you can find a simple proof that precisely describes all cases of a particular situation it can save you time - no more checking a lot of different values.
 


When x is an integer, 2x - 1 will always be an odd number, regardless of the value of x; what is the proof?





 
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