Checkboxes value for multiple choices

Hi again. It seemed like a dumb question, but I can’t figure it out.

Let’s say, I have a checkboxes field (fieldname123) with “1”,”2″ and “3” options. I need to create a condition that works if the user selects “1”. If I write IF(fieldname123==1,…) it works if the user selects option “1” only. But it doesn’t work if he selects, for example, both “1” and “2”. What condition should I write to make the function work if the user selects a certain option, no matter if he selects other ones or not?

Thanks in advance.


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