Turn one card facing up. What is the probability that it shows a circle?
A) \[\frac{2}{7}\]
B) \[\frac{5}{7}\]
C) \[\frac{3}{7}\]
D) \[\frac{1}{7}\]
Correct Answer: A
Solution :
Since there are 7 cards, \[\text{n(S)}\,\text{=7}\]. Let A be the event of picking a card having a circle,\[\text{n(A)}\,\text{=}\,\text{2}\]. The probability of picking a card having a circle \[\text{P(A)}\,\text{=}\frac{n(A)}{n(S)}=\frac{2}{7}\]
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