Posted by Anita on Monday, January 11, 2010 at 8:45pm.
In an interview of 50 math majors,
12 liked calculus and geometry
18 liked calculus but not algebra
4 liked calculus, algebra and geometry
25 liked calculus
15 liked geometry
10 liked algebra but neither calculus nor geometry
2 liked geometry and algebra but not calculus.
Of those surveyed, how many liked calculus and algebra?

Algebra  PsyDAG, Tuesday, January 12, 2010 at 10:58am
If you want the number that liked both calculus and algebra, there is only one category that fits that description.
I hope this helps.