Sum or Count Boolean values in a list view | Community

I have a list view on my form, and each item has a 'Selected' check box which is displayed as true/false in the display row

Is there a way that I can sum or count the items in the list where Selected is checked/true for validation purposes?

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Turns out this is simpler than I thought, I just hadn't tried it this way before:

All you need to do is to add a control (textbox or label) to the list view, and assign it an expression that calculates the List Sum of the boolean value column source

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