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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: sets:
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[Post New]25 May 2008 21:58:24 IST
    Subject: sets:
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kishore.subramanian.b (200)

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Out of 60 students , 25 failed in paper1 , 24 in paper 2 , 32 in paper 3 ,  9  in paper 1 alone,  5 in paper 2 and paper3 , 3 in paper1 and paper2 . find how many failed in all the three papers....
    
[Post New]25 May 2008 22:42:50 IST
    Subject: Re:sets:
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allamraju (3422)

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I think the ans is [0,3].I mean,The no. of people failing in all three subjects can be 0,1,2,3.Is it correct?Plz reply soon.
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[Post New]26 May 2008 10:12:24 IST
    Subject: Re:sets:
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kishore.subramanian.b (200)

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no.....it's 10....
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[Post New]26 May 2008 16:35:19 IST
    Subject: sets:
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hpudipeddi (77)

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I will support the version of Allam Raju. The set of students failed in P1 and P2 contains 3 elements hence any set intersected with this set cannot contain more than three elements. Else some data must be missing therefore once again check the question and come back to me.
<TABLE CELLSPACING="1" CELLPADDING="1" BORDER="0">
<TR><TD>


<DIV ALIGN="right">Glitter Graphics</DIV></TD></TR></TABLE>
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[Post New]26 May 2008 16:37:45 IST
    Subject: sets:
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spideyunlimited (3912)

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It cannot be 10 since Students failing in all three has to be a subset of those failing in 1 and 2... as well as a subset of those failing in 2 and 3.
which is 5 and 3 .... so it can be maximum 3 and minimum 0

[0, 3] only is the set.
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