4 doors, 1 car

You find yourself on a game show.

The host presents you with four doors.

Behind three doors are an assortment of gummy bears. The fourth door has a pure gold car behind it!

You pick a door, then the host reveals a door behind which he knows is only a couple of red gummy bears.

Then you are given the choice to stick with your first choice or change to one of the other two unopened doors.

If the probability that you will win the car if you switch is \( \dfrac ab\), where \(a\) and \(b\) are coprime positive integers, what is \(a+b\)?

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