Fortune Telling Collection - Free divination - If you choose any of the three playing cards of "hearts 5, hearts 7 and hearts 9", the probability of winning "hearts 7" is a.b.c.d 。
If you choose any of the three playing cards of "hearts 5, hearts 7 and hearts 9", the probability of winning "hearts 7" is a.b.c.d 。
B
Analysis: According to the meaning of the question, there are ***3 playing cards, of which 1 is "7 of hearts". According to the calculation formula of probability, the answer can be obtained.
According to the meaning of the question, ***3 playing cards, of which 1 is "7 of hearts".
Then the probability of drawing "7 of hearts" is,
So choose B.
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