Qualification > Math
S1 and S2 DOUBTS HERE!!!!
Freaked12:
Oh
This is already done
sorry
Ivo:
A dice is known to be biased in such a way that, when it is thrown, the probability of a 6 showing is . This biased dice and an ordinary fair dice are thrown. Find the probability that exactly one of the two dice shows a 6, given that at least one of them shows a 6.
Many thanks in advance; what does that last sentence even mean?!
Arthur Bon Zavi:
--- Quote from: Ivo on November 10, 2010, 08:02:59 pm ---A dice is known to be biased in such a way that, when it is thrown, the probability of a 6 showing is . This biased dice and an ordinary fair dice are thrown. Find the probability that exactly one of the two dice shows a 6, given that at least one of them shows a 6.
Many thanks in advance; what does that last sentence even mean?!
--- End quote ---
You have to find the probability that; if together both the dices are thrown, at-least from both, 1 shows a six, and from both 1 has to show 6.
1 1 5
-- + --- = -----
4 6 12
Is this the answer ?
Deadly_king:
--- Quote from: Ancestor on November 11, 2010, 05:03:55 am ---You have to find the probability that; if together both the dices are thrown, at-least from both, 1 shows a six, and from both 1 has to show 6.
1 1 5
-- + --- = -----
4 6 12
Is this the answer ?
--- End quote ---
Nope........you did it wrong there dude.
The question asked at least a six form both dices but exactly one six should be obtained.
Hence probable results are :
1. 6 from biased die and any other number from unbiased die.
2. Any other number from unbiased die and 6 from unbiased die.
Probability : (1/4 x 5/6) + (3/4 x 1/6) = 1/3
Arthur Bon Zavi:
--- Quote from: Deadly_king on November 11, 2010, 05:16:55 am ---Nope........you did it wrong there dude.
The question asked at least a six form both dices but exactly one six should be obtained.
Hence probable results are :
1. 6 from biased die and any other number from unbiased die.
2. Any other number from unbiased die and 6 from unbiased die.
Probability : (1/4 x 5/6) + (3/4 x 1/6) = 1/3
--- End quote ---
Yeah !! :D
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