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Graph Theory
easy
0:00.0
What is the degree of a vertex in
K
r
,
r
K_{r,r}
K
r
,
r
?
A
2
r
2r
2
r
B
r
−
1
r - 1
r
−
1
C
r
+
1
r + 1
r
+
1
D
r
r
r
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