Let's start from the top:
There is a 1/36 chance of rolling a 2
There is a 2/36 chance of rolling a 3
There is a 3/36 chance of rolling a 4
Adding them up, we get 6/36, or 1/6.
Subtracting this from unity (1) we get 5/6.
There is a 1/12 chance of spinning a 2
There is a 1/12 chance of spinning a 4
There is a 1/12 chance of spinning a 6
There is a 1/12 chance of spinning a 8
There is a 1/12 chance of spinning a 10
There is a 1/12 chance of spinning a 12
Adding them up, we get 6/12, or 1/2
Multiplying the numerators and denominators horizontally, we get \(\tfrac{5}{12}\).
Did this help? I hope it did! 
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