A fair dice is thrown twice.Find the probability that at least one of the numbers obtained is a prime number.

解

A f ai r d i ce i s t h ro w n tw i ce . F in d t h e p ro babi l i t y t ha t a t l e a s t o n e o f t h e n u mb ers o b t ain e d i s a p r im e n u mb er .

\frac{11}{36}

十進法表記

0.30555 \dots

解答ステップ

Find the probability of no 1:

\frac{25}{36}

Probability of at least 1 of the numbers obtained is a prime number

= 1 -

Probability of no 1

= 1 - \frac{25}{36}

1 - \frac{25}{36} = \frac{11}{36}

= \frac{11}{36}