Question

A bag contains '3' red balls and 4 black balls. A ball is selected at
random from the bag, what is the probability that the ball selected
1) Black 2) Red

Answer 1

Answer:

1 black 4/7

2 red 3/7

total ball =3+4

=7

Answer 2

Answer:

4/7   and   3/7

Step-by-step explanation:

(i) Possible ways to select a black from 4 black balls is ⁴C₁ = 4

   Total ways to select 7 balls = 7

Probability = ⁴C₁/7

                  = 4/7

(ii) Possible ways to select a red from 3 red balls is ³C₁ = 3

   Total ways to select 7 balls = 7

Probability = ³C₁/7

                  = 3/7