Fall sum or same

Find the probability that if you roll two dice, it will fall the sum of 10, or the same number will fall on both dice.

Correct answer:

p =  0.2222

Step-by-step explanation:

$$\begin{gathered} n_1=6:11,22,33,44,55,66 \\ {n}_2=3:46,55,64 \\ {n}_1\cap n_2:155 \\ p={\displaystyle \frac{6+3-1}{6\cdot 6}}={\displaystyle \frac{2}{9}}=0.2222 \end{gathered}$$

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