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

Question

 

 My answer is AUB=[-1;6[ Is it correct?

Answer 1

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.