How to select limited number of multiple options

I am designing a form on which one of the questions requires multiple
answers but only up to TWO (2).
How do I implement this on my form?

count-selected(.)=2

Add that in the constraint column

··· On Jan 26, 2017 5:20 AM, "T Makawa" wrote:

I am designing a form on which one of the questions requires multiple
answers but only up to TWO (2).
How do I implement this on my form?

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Works perfectly thanks.

··· On Thursday, January 26, 2017 at 8:34:12 AM UTC+2, Louis Omoya wrote: > > count-selected(.)=2 > > Add that in the constraint column > > > > On Jan 26, 2017 5:20 AM, "T Makawa" <mtma...@gmail.com > wrote: > >> I am designing a form on which one of the questions requires multiple >> answers but only up to TWO (2). >> How do I implement this on my form? >> >> -- >> -- >> Post: opend...@googlegroups.com >> Unsubscribe: opendatakit...@googlegroups.com >> Options: http://groups.google.com/group/opendatakit?hl=en >> >> --- >> You received this message because you are subscribed to the Google Groups >> "ODK Community" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to opendatakit...@googlegroups.com . >> For more options, visit https://groups.google.com/d/optout. >> >