If x do all three, then
17+16+15 - (7+6+8) + x = 40-7
solve for x.
Now you can fill in the Venn diagram and answer the other questions.
in a class of 40 students 17 students offer biology 16 offer physics 15 offer chemistry and 8 offer none of the three subjects if 7 students offer both biology and physics, 6 students offer both physics and chemistry and 8 students offer both biology and chemistry find the number of students that offer (a )all the three subjects( b)exactly one subject (C)exactly two subject (D) at least two subjects (E) at least one subject using a venn diagram
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