Hi, Ulfa.
If you want to do it like that, you need to use conditional and variables.
Here is a brief guide for it:
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Create 2 variables:
a. Bolean Variable
b. Number Variable
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Separate the string on the [1 selected] into [Count + Selected] and apply the variable count into the Count.
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Apply the boolean variable on the instance of the button component.
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On the Radio Button Component, add a click event on the unchecked radio button variant:
5.and add this event on the checked radio button variant
After doing this, the prototype should be like this: