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Practice: Conditional Probability: Tree Diagrams

A bag contains 3 blue balls and 7 red balls. David selects 2 balls without replacement and draws the following tree diagram.

Given that the first ball is red, find the value of 𝑥 that represents the probability that the second ball selected is red.

  • A79
  • B710
  • C35
  • D13
  • E23

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