Question

n(A - B) is equal to: *
n(A) – n(A⋃B)

n(A) – n(A∩B)

n(B) – n(A∩B)

n(ξ) – n(A⋃B)
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Answer 1

Answer:

乙醇浓度和不受相关部门对象时代？？馅了解他人阅读能力是一样的啊啊啊啊啊的好？？？

Answer 2

Answer:

n(A∪B)=n(A)+n(B)−n(A∩B)−−−−−−−(1)

n(A∪B)=n(A)+n(B)−n(A∩B)−−−−−−−(1)Given n(A)=7

n(A∪B)=n(A)+n(B)−n(A∩B)−−−−−−−(1)Given n(A)=7n(B)=9

n(A∪B)=n(A)+n(B)−n(A∩B)−−−−−−−(1)Given n(A)=7n(B)=9n(A∪B)=14

n(A∪B)=n(A)+n(B)−n(A∩B)−−−−−−−(1)Given n(A)=7n(B)=9n(A∪B)=14Substituting in 1

n(A∪B)=n(A)+n(B)−n(A∩B)−−−−−−−(1)Given n(A)=7n(B)=9n(A∪B)=14Substituting in 114=7+9−n(A∩B)

n(A∪B)=n(A)+n(B)−n(A∩B)−−−−−−−(1)Given n(A)=7n(B)=9n(A∪B)=14Substituting in 114=7+9−n(A∩B)⇒n(A∩B)=16−14=2