Current location - Quotes Website - Collection of slogans - As shown in the figure, there are 10 cards with the theme slogan of Beijing 2008 Olympic Games written on the front, and the back is the same. Wash them and put them away.
As shown in the figure, there are 10 cards with the theme slogan of Beijing 2008 Olympic Games written on the front, and the back is the same. Wash them and put them away.
According to the meaning of the question, * * * has ten cards.

A means that the Chinese character "Tong" is opened at will. Only two cards have the Chinese character "Tong" on them.

Then p (a) = the total number of basic events in the number S contained in A = the number of cards of the same Chinese character =kn= 15.

So answer: 15.