Sum or product

What is the probability that two dice fall will have the sum 7 or product 12?

Correct answer:

p =  0.2222

Step-by-step explanation:

$$\begin{gathered} X=(2+5,1+6,3+4,2.6) \\ t=6\cdot 6\mathrm{/}2=18 \\ p=4\mathrm{/}t=4\mathrm{/}18=0.2222 \end{gathered}$$

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