In a box there are 6 red and 4 blue balls. By chance, one balli s...

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In a box there are 6 red and 4 blue balls. By chance, one balli s...

In a box there are 6 red and 4 blue balls. By chance, one balli s taken out. If the balli s red, it is put aside. If the balli s blue, it is returned into the box. What is the probability that the second ball taken will be blue?

math Statistics-And-Probability

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Answer 1

Answer #1

Tree diagram

P(second ball taken will be blue) = P(first ball was red and second ball is blue) + P(first ball is blue and second ball is blue)

= (6/10 x 4/9) + (4/10 x 4/10)

= 0.4267

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Answer 2

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