Solution:
We know that, the number of straight lines that can be formed by the 11 points in which 6 points are collinear and no other set of three points,
except those that can be selected out of these 6 points are collinear.
Hence, the required number of straight lines
= ¹¹C₂ - ⁶C₂ - ⁵C₂ + 1 + 1
= 55 - 15 - 10 + 2 = 32