[Solved] If A and B are selected within same dropdown, how do I disable C?

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Here is a quick example…basically in the jQuery function you need to check which options are selected and then execute the disable logic…this is a template:

https://jsfiddle.net/6kdthxgr/3/

const list = $('#list');
const both = list.find('option:last-child');

list.on('change', () => {
  if (list.find('option:selected').length === 2 &&
    !both.prop('selected')) {
    both.prop("disabled", true);
  }
});

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solved If A and B are selected within same dropdown, how do I disable C?