[R] How to delete a duplicate observation

[nuyaying]

I have a data set with 3 variables V1, V2, V3.  If there are 2 data points
have the same values on both V1 and V2,  I want to delete one of them which
has smaller V3 value.    i.e., in the data below, I want to delete 
the first observation.  How can I do that ?    Thanks in advance!      

V1  V2  V3
3    3     1
3    3     4

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