Ram put some buttons on the table.

Question:

Ram put 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) 7/20

(b) 3/5

(c) 1/5

(d) ¼

 

Solution:

(c) 1/5

Probability = Number of blue buttons on the table / Total number of buttons on the

table

= 4/20 … [divide both numerator and denominator by 4]

= 1/5

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