问题
单项选择题
Suppose a given binary tree has 10 left nodes，then the number of nodes with degree of 2 is( )。
A．12
B．11
C．9
D． Indeterminable
答案
参考答案：C
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Suppose a given binary tree has 10 left nodes，then the number of nodes with degree of 2 is( )。
A．12
B．11
C．9
D． Indeterminable
参考答案：C