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Grade 12th passMagical Mathematics[Interesting Approach]

Two balls are drawn at random from an urn containing 5 white and 3 red balls. The first ball is not replaced before the second ball is drawn. Find the probability that the first ball is red, conditional on the second ball being red.

i am getting 2/7. can someone pls clarify

shiya

7 Years agoGrade 12th pass

1 Answer

Arun

Approved Tutor Answer7 Years ago

Dear student

required probability = (3/8 * 2/7) /[(3/8 * 2/7) + (5/8* 3/7)]

= 6/21 = 2/7 is correct answer

Regards

Arun

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