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If two cycle graphs Gm and Gn are joined together with a vertex, the number of spanning trees in the new graph is ______
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Question:If two cycle graphs Gm and Gn are joined together with a vertex, the number of spanning trees in the new graph is ______
1.m+n-1
2.m-n
3.m*n
4.m*n+1
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Answer:3
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