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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: Probability III
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[Post New]18 Apr 2008 11:52:30 IST
    Subject: Probability III
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m.viddya (101)

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Q.Out of 15 persons 10 can speak Hindi and * can speak English .If 2 persons are chosen at random then the probability that one speaks only Hindi and the other speaks both is?
 
1.3/5
 
2.7/12
 
3.1/5
 
4.2/5
    
[Post New]18 Apr 2008 12:01:06 IST
    Subject: Probability III
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akhil_o (2709)

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10 speak hindi...8 speak english
10+8-15=3 ppl speak both

10-3=7 ppl spk only hindi
so required case=3C1*7C1=21

total case=15C2=105

so P=21/105
=1/5
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