.
Car_only = Car - (Car and Bicycle) - (Car and Bike) + (All_the_three) = 140 - 20 - 35 + 11 = 96. ANSWER
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It is nice problem.
If you want to learn MORE about this subject, look into my lessons
- Counting elements in sub-sets of a given finite set
- Advanced problems on counting elements in sub-sets of a given finite set
- Challenging problems on counting elements in subsets of a given finite set
in this site.
They are really SWEET and CRISPY problems, and SWEET and CRISPY lessons.
It is worth to read (!)
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When you complete reading, come again and ask me, what to read next . . .