You get heads half of the times, since you have one, good outcome out of two.Similarly, you get 5 on the die once every six times, on average.These events happens simultaneously with probability
These are independent events so the added probability is calculated by multiplying the two separate probabilities.
To get heads is 1/2
To roll 5 is 1/6
So P=1/2 * 1/6 =1/12
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