A △\triangle or ◯\bigcirc is placed in each of the nine squares in a 33-by-33 grid. Shown below is a sample configuration with three △\triangles in a line.How many configurations will have three △\triangles in a line and three ◯\bigcircs in a line?
A. 39
B. 42
C. 78
D. 84
E. 96

Systematic enumeration中文
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D. 84

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