A) 210
B) 205
C) 215
D) 220
Correct Answer: B
Solution :
Required number of triangles \[{{=}^{12}}{{C}_{3}}-{{(}^{3}}{{C}_{3}}{{+}^{4}}{{C}_{3}}{{+}^{5}}{{C}_{3}})=205\]You need to login to perform this action.
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