Complete incidence matrix & its properties

Q.  Consider the assertions given below. Which among them do/does not specify/ies the property of 'Complete Incidence Matrix'?
- Published on 06 Oct 15

a. Determinant of a loop of a complete incidence matrix is always zero
b. Addition of all entries in any column should never be equal to zero
c. Rank of connected or oriented graph is always 'n-1'
d. All of the above

ANSWER: Addition of all entries in any column should never be equal to zero

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