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The column sum in an incidence matrix for a directed graph having no self loop is __________

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The column sum in an incidence matrix for a directed graph having no self loop is __________

(a) 0

(b) 1

(c) 2

(d) equal to the number of edges
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Correct choice is (a) 0

Easy explanation - Under every edge column there would be either all 0 values or a pair of -1 and +1 value exists.
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