Random Integer between 2 separate intervals [duplicate]

This question already has an answer here:

• How can I generate a random number within a range but exclude some? 8 answers

I have the following question.

How can you generate a random Integer between e.g. 1-7 and 10-26

I think it's quite easy but I don't seem to find a solution.

I apologize if my question has already been asked.

I'd appreciate any kind of help :)