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What are the dimensions of an incidence matrix?

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What are the dimensions of an incidence matrix?

(a) Number of edges*number of edges

(b) Number of edges*number of vertices

(c) Number of vertices*number of vertices

(d) Number of edges * (^1⁄2 * number of vertices)

This interesting question is from Incidence Matrix and Graph Structured Stack topic in division Graph of Data Structures & Algorithms I

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Right answer is (b) Number of edges*number of vertices

Easiest explanation - Columns may represent edges and vertices may be represented by the rows.

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