night tulip
What the chart is saying that
From a group of smoothies, 3 are just lemon, 7 are both mango and lemon, 11 are just mango, and 9 are neither
Prob(A or B) —> 1 - Prob(neither A nor B)
The chance of a smoothie having neither mango or lemon is 9 (smoothies containing neither) out of 30 (total smoothies) so the chance a smoothie has lemon or mango is ||21/30 —> 7/10||
mighty terrace