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Get access to the detailed solutions to the previous years questions asked in IIM IPMAT exam
Joining any 2 points will give a line so selecting any 2 points from 12 points
= 10C2
But line formed by joining 1 any two points from 5 co – linear points will result in single line
So we need to subtract 5C2 from 10C2 & add 1 for line resulted by joining any of co – linear point.
= 10C2 – 5C2 + 1
= (10 × 9)/2 – (5 × 4)/2 + 1
= 45 – 10 + 1
= 36