CBSE Class 12-science Answered
probability _atleast one post-atleast two posts
Asked by | 13 Feb, 2009, 08:41: PM
Expert Answer
prob of being selected at first post = p1 = 1/5
similarly for second post = p2 = 1/4
and for third = p3 = 1/6
prob that he will be selected for atleast one post
=1 - (he is not selected at any post)
=1 - (1-1/4) ( 1-1/5) (1-1/6)
=1 - 3.4.5/4.5.6 = 1/2
prob that he will be selected for at least two posts
=p1.p2(1-p3) + (1-p1).p2.p3 +(1-p2).p1.p3
=(3+4+5) / 4.5.6
=1/10
Answered by | 16 Feb, 2009, 09:33: PM
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