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An exact cover problem can be represented using:

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An exact cover problem can be represented using:

(a) incidence matrix

(b) bipartite graph

(c) both (a) and (b)

(d) none of the mentioned
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Correct choice is (c) both (a) and (b)

Easiest explanation: The relation ‘contains’ can be represented using a bipartite graph. The vertices of the graph can be divided into two disjoint sets, one representing the subset S and the other representing the elements of P and one edge for each subset in S;each node is included in exactly one of the edges forming the cover.
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