Two fair dice are thrown together. What is the probability of rolling a total of 7?

解

Tw o f ai r d i ce a re t h ro w n t o g e t h er . Wha t i s t h e p ro babi l i t y o f ro ll in g a t o t a l o f 7 ?

\frac{1}{6}

十進法表記

0.16666 \dots

解答ステップ

The possible outcomes when two dice are rolled are

6 \cdot 6

Therefore, the number of possible outcomes:

6^{2}

Find the number of favorable outcomes of rolling a total of 7:

6

Probability

= \frac{number of favorable outcomes}{total number of outcomes}

= \frac{6}{6 ^{2}}

共通因数を約分する:

6

= \frac{1}{6}