A) (a) 180
B) (b) 185
C) (c) 181
D) (d) 190
Correct Answer: B
Solution :
[b] Required no. of triangles \[{{=}^{12}}{{C}_{3}}={{\,}^{7}}{{C}_{3}}=\frac{12\times 11\times 10}{3\times 2}-\frac{7\times 6\times 5}{3\times 2}=220-35=185\] Option [b] is correct.You need to login to perform this action.
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