Question: please give the answer in correct way show the working how they get answer step by step please because i do not understand this question

please give the answer in correct way show the working how they get answer step by step please because i do not understand this question show working all thank you so much please answer all thank you again please tell me what chapter is this

B

B'

A

10

30

A'

30

90

What is the probability of event?

  1. A |B
  2. A | B'
  3. A'|B'
  4. Are event A and Bindependent?

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