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[" In a box,there are "20" cards,out of ...

[" In a box,there are "20" cards,out of which "10" are labelled as "A" and the "],[" remaining "10" are labelled as "B" .Cards are drawn at random,one after "],[" the other and with replacement,till a second A-card is obtained.The "],[" probability that the second A-card appears before the third "],[" B-card is "]

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