There are an infinite number of numbers between any two different numbers. 

Answer by ikleyn(52802)   (Show Source): You can put this solution on YOUR website!
 .

I will assume that the question relates to integer numbers.





Then there are 21 integer numbers between -10 and 10, if the endpoints are included, 

and 19 integer numbers between -10 and 10, if the endpoints are excluded.







Do you see now, how many necessary conditions are missed in your post ?







 

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