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Which of the following statements is/are TRUE for undirected graphs?

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Which of the following statements is/are TRUE for undirected graphs? P: Number of odd degree vertices is even. Q: Sum of degrees of all vertices is even. 

(A) P only 

(B) Q only 

(C) Both P and Q

(D) Neither P nor Q

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(C) Both P and Q

Q: Sum of degrees of all vertices =2 × (number of edges)

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