Question

a bag contains 7 red ball and 4black balls ,3 balls are drawn at random,find probability that all r red

Answer 1

probability=red balls/total no.of balls
=3/11
3/11 because only 3 balls are drawn at random
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Answer 2

Answer:

Step-by-step explanation:

N(s)= 7+4=11

N(e)= 7

P(e)=n(e)/n(s)

=7/11