jquery - show/hide checkbox based on select option value -

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How to show / hide a checkbox based on the selection option value? I want to show a check box on the basis of a single value in the chosen option and when it is chosen another value, then hide it. I'm trying to jquery solution 

  $ ('# abcselect'). Change (function () {$ ('# unknownness'). Toggle ($ (this) .val () = = 'first')});   $ (document) .ready (function () {$ (" Select "). Change (function () {$ (" #Foo ") Toggle ($ (this) .val () ==" something "))}}. Change (); // if the first option is selected on page load}};

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