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A=[-1;3] B=]2;6[ AUB=? How do i do this? help me plz.

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1 Answer

Your answer is correct, Gundegma.  You can always draw a number line to help you visualize:
 
    -3     -2     -1       0       1      2      3       4       5       6       7      8      9
<--|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-->
                       [===============]  [-1,3]
                                                  [===============]  [2.6]
 
                       [===========================]  [-1,3]U[2,6] = [-1,6]
 
Another way to think of it is that the union operation (U) combines the two sets into one set, so it includes all numbers between -1 and 6.