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]
Answers
Answered by
0
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
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Answered by
0
Step-by-step explanation:
sample space (s)=7+4+5=16
p(a)=n(a)÷n(s)
= 4÷16
= 1/4
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