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April 18, 2015

April 18, 2015

Posted by **A** on Friday, August 15, 2014 at 12:23pm.

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**PsyDAG**, Friday, August 15, 2014 at 1:15pmIf the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.

For blue = 4/6 * 3/5 = 2/5

For green = 2/6 * 1/5 = 1/10

Either-or probabilities are found by adding the individual probabilities.

2/5 + 1/10 = ?

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**A**, Friday, August 15, 2014 at 1:18pm2/5+1/10 is 5/10.

But in my book it states that the answer is 7/15, without an explanation.

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**Reiny**, Friday, August 15, 2014 at 11:29pmEither two blues or two greens

prob of 2 blues = (4/6)(3/5) = 2/5

prob of 2 grees = (2/6)(1/5) = 1/15 , this is where PsyDAG slipped up

so prob of 2 of same colour = 2/5 + 1/15 = 7/15

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**PsyDAG**, Saturday, August 16, 2014 at 1:50pm⁄Mia Culpa! Sorry.

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