Answer:
A) Outside both: 7
Intersection: 6
Only ET: 7
Only NDC: 10
B) 17/30
Step-by-step explanation:
Outside both: 7
Union: 30 - 7 = 23
Intersection: 13 + 16 - 23 = 6
Only ET: 13 - 6 = 7
Only NDC: 16 - 6 = 10
P(only one) = (7+10)/30
17/30
