that gives the number owning at least one of the three.
Just started S1, just wondering if you could help me out with this question?
Many thanks
Then500 people own a fish, dog or cat. Of this, 314 own a fish, 228 own a dog and 312 own a cat. of these, 160 own a fish and a dog, 100 own a dog and a cat, 134 own a cat and a fish. calculate the number which own all 3 pets
tried:By using set notation, express these 3 events as at least two of these events occurring.
500 = F + (C-(C n F)) + (D - (D n F)) - (D n C) + (ALL3)
This gives me a silly answer so must be wrong
Hm... I got 40 for the first part...
Of if you like, I made 7 equations with 7 variables. From my Venn diagram, I labeled the parts a to g where e is the intersection af all three groups.
a+b+c+d+e+f+g = 500, a+b+d+e = 314, b+c+e+f = 228, d+e+f+g = 312, b+e = 160, e+f = 100, d+e = 134 - Wolfram|Alpha