IIT JEE Advanced 2009 Paper 1

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Let Λ be the set of all 3×3 symmetric matrices all of whose entries are either 0 or 1 . Five of these entries are 1 and four of them are 0 .
Section: Mathematics
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Question : 56 of 60
 
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The number of matrices in Λ is
[JEE Adv 2009 P1]
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