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Probability

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Probability

by priyankamishra11 » Mon Sep 15, 2008 5:45 am
Can anyone solve this?

The probability is that a red marble will be selected from a bag is 1/3. If a marble is selected and replaced three times, what is the probability that a red marble will never be selected?

1/27
2/27
8/27
1/3
2/3
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Priyanka
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by manulath » Mon Sep 15, 2008 6:27 am
is the answer 8/27??

probability of not selecting red marble = 1 - 1/3 = 2/3

marble is replaced after every selection, hence the probabilities remain same for every event

for 3 times red marble not selcted: 2/3 * 2/3 * 2/3 = 8/27

................................
Manu
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