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Q. Bag 1 contains 3 red and 4 black balls and bag 2 contains 4 red and 5 black balls. Two balls are transferred at random from bag 1 to bag 2 and then a ball is drawn from bag 2. The ball so picked turns out to be red. Find the probability that the transferred balls were both black. What should be the correct answer- 4/17 or 4/7.

Note by Amyanshu Jenamani
4 months, 3 weeks ago

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  Easy Math Editor

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Can someone check out my post and tell me what you think of it? I'm stuck and need help!

Chillwillybillysilly . - 4 months, 2 weeks ago

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What have you tried? Can you show your working?

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