A) 3
B) 4
C) 5
D) 6
Correct Answer: C
Solution :
[c] Out of 10 points let n points be collinear. Then the number of triangles is \[^{10}{{C}_{3}}{{-}^{n}}{{C}_{3}}=110\] or \[\frac{10\times 9\times 8}{6}-\frac{n(n-1)(n-2)}{6}=110\] or \[n(n-1)(n-2)=60\] or \[n=5\]
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