1.

A reduced incidence matrix of a graph is given by \(\left[ A \right] = \left[ {\begin{array}{*{20}{c}}1&1&0&0&1\\0&{ - 1}&1&0&0\\{ - 1}&0&{ - 1}&{ - 1}&0\end{array}} \right]\) The number of possible trees is

A. 8
B. 15
C. 16
D. 17
Answer» B. 15


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