Question

A bag contains 8 black and 5 blue balls, three balls are drawn at random without replacement. What is the probability that all drawn balls are black in colour?

Answer 1

number of black balls = 8

number of blue balls = 5

total number of balls = 8+5 = 13

so, probability of all balls are black in colour = 3/13

Answer 2

Answer:

Step-by-step explanation:

Number of black balls = 8

Number of blue balls   = 5

Total Number of balls  = 13

Probability of getting all black balls = $\frac{8}{13} * \frac{7}{12}*\frac{6}{11}$

                                                           =$\frac{28}{143}$