Question

Example 13. A bag contains 7 red, 4 white and 5 black balls.
Two balls are drawn at random and are found to be white. What is
the probability that all balls are white.
[AICBSE 2010]​

Answer 1

Answer:

1/7

Step-by-step explanation:

after two white balls are drawn out total 7 red,2 white and 5 black ball will remain in the bag because two white balls are already drawn out

total balls =14

no. of white balls=2

probability of being a white ball=no. of white balls/ total balls

=2/14

=1/7

brainliest mark

Answer 2

Step-by-step explanation:

sample space (s)=7+4+5=16

p(a)=n(a)÷n(s)

= 4÷16

= 1/4