Ram puts some buttons on the table. There were 4 blue, 7 red, 3 black and 6 white buttons in all. All of a sudden, a cat jumped on the table and knocked out one button on the floor. What is the probability that the button on the floor is blue?
- A$\frac{7}{20}$
- B$\frac{3}{5}$
- ✓$\frac{1}{5}$
- D$\frac{1}{4}$
Answer: C.
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