Respuesta :
We are told there are 3 colors of postcards (blue, white or green) and 3 possible animals printed on them (fish, insect or bird).
Since each of the 3 colors can have any of the 3 animals printed on them, we can deduce there are 9 possible combinations of postcards (blue-fish, blue-insect, blue-bird, white-fish, white-insect, white-bird, green-fish, green-insect or green-bird).
Finally, we are told that there is an equal number of each type of postcard available. This means, the probabilty that Jacob was given a green-fish postcard is 1 in 9, as there is only one postcard out of all 9 possible combinations that meets the criteria.
In other words:
[tex]P(\text{green-fish)=}\frac{1}{9}\approx0.1111[/tex]Or P(green-fish)=11.11%
