I have a numeric question with 2 options + "Don't Know" option.
Respondent can either provide response in two numeric options or can select "Don't Know". Please refer snapshot for your better understanding of requirement and share your inputs on how to achieve it. 
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You will have to create 2 questions; one with the 2 text boxes and another a multi-punch.
Then add a code on keypress function (google it) if the checkbox is clicked then empty the text box and then onChange if the textbox.length>=1 then remove the check from checkbox.
Thanks grahulp5 :)
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