Magical Mathematics[Interesting Approach]> there are n bags such that i’th bag conta...

there are n bags such that i’th bag contains i black and 2 white balls.Two balls are drawn from a randomly selected bag out of n bags.fInd the probability that both balls drawn are white.

Answer =1/(n+2)

i’m getting a different answer.

Praveen Kumar Das , 6 Years ago

Grade 12th pass

2 Answers

Praveen Kumar Das

Ihere are n bags such that i’th bag contains i black and 2 white balls.Two balls are drawn from a randomly selected bag out of n bags.fInd the probability that both balls drawn are whiteGOT THE ANSWER 1/(N+2) NOW...Thanks

Last Activity: 6 Years ago

Ronak Singhvi

Assume that i have selected i’th bag

probability of selecting 1 bag from n bags =1/n

probability of selecting 2 white balls at a time from the selected bag = ²C₂/ⁱ⁺²C₂ = 2/(i+2)(i+1) =[1/(i+1) – 1/(i+2) ]×2

toytal probability= 2/n ∑ (1/(i+1) – 1/(i+2) ] = 2/n [ ½ – 1/n+2] = 1/n+2

Last Activity: 6 Years ago

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Magical Mathematics[Interesting Approach]> there are n bags such that i’th bag conta...

there are n bags such that i’th bag contains i black and 2 white balls.Two balls are drawn from a randomly selected bag out of n bags.fInd the probability that both balls drawn are white. Answer =1/(n+2) i’m getting a different answer.

Praveen Kumar Das , 6 Years ago

Praveen Kumar Das

Ronak Singhvi

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there are n bags such that i’th bag contains i black and 2 white balls.Two balls are drawn from a randomly selected bag out of n bags.fInd the probability that both balls drawn are white.

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i’m getting a different answer.