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[" ILLUSTRATION 2Let A be the set of all...

[" ILLUSTRATION 2Let A be the set of all 3"times3" symmetric matrices "],[" all of twhose entries are either 0or 1such that five of these entries are 1"],[" and four are 0.The number of matrices in set "A," is "],[[" (a) "12," (b) "6," (c) "9," (d) "3]]

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