The answer to your question above would be: 7z-2/z-7
20 students are going to the trip and of those 20, 10 are bringing their own lunches
12 would be your answer
-2*-1= 2
2*6=12
so 12
P(a ∪ b) = p(a) + p(b) - p(a ∩ b)
p(a ∩ b) = p(a) + p(b) - p(a ∪ b)
p(a ∩ b) = 1/3 + 2/5 - 3/5
p(a ∩ b) = 2/15
Hi, answer to your functional equation on the photo
