A) \[^{6}{{C}_{3}}-7\]
B) \[^{6}{{C}_{3}}-6\]
C) \[^{6}{{C}_{3}}-5\]
D) \[^{6}{{C}_{3}}-4\]
Correct Answer: B
Solution :
No. of triangles =\[^{6}{{C}_{3}}\,-\,6\].
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