If we are given the adjacency matrix of a weighted (undirected)graph,how can we use it to determine the number of edges in the graph?

Name: If we are given the adjacency matrix of a weighted (undirected)graph,how can we use it to determine the number of edges in the graph?
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The Answer of If we are given the adjacency matrix of a weighted (undirected)graph,how can we use it to determine the number of edges in the graph?

If We Are Given the Adjacency Matrix of a Weighted