How do i restrict multiple choice response to only 3 answers?

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How do i restrict multiple choice response to only 3 answers?

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There actually an example of precisely this here: Form Operators and Functions - ODK Docs

Basically, you just need to use the count-selected() function in a constraint. If you require exactly three responses then use ‘=’ in the constraint; if you want a maximum of three then use ‘<=’ instead.

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