Checking for any combination of more than one checkbox

I have three checkboxes and i need to know what combination of checkboxes are checked, i was thinking of doing something like this and adding else if for every other possible combination.

$("#cbOne, #cbTwo, #cbThree").click(function () {
    if ($("#cbOne").is(":checked") == true && $("#cbTwo").is(":checked") == false && $("#cbThree").is(":checked") == false) {
        // do something;
});

Unfortunately i can't get it to work, any tips?