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Amy was born on a Tuesday. What is the probability that exactly two of her three best friends were also born on Tuesday? Express your answer as a common fraction.

 Feb 16, 2020
 #1
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What geno said.

 Feb 16, 2020
edited by AnimalMaster  Feb 16, 2020
edited by AnimalMaster  Feb 16, 2020
 #2
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It's the probability they are born on a Tuesday versus another day

Guest Feb 16, 2020
 #3
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2/7?

AnimalMaster  Feb 16, 2020
 #4
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The probability of being born on a Tuesday is 1/7.

The probability of not being born on a Tuesday is 6/7.

You want to choose 2 out of a possible 3.

 

3C2 · (1/7)2 · (6/7)1  =  your answer

 Feb 16, 2020
 #5
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Thank geno! I got 18/343

Guest Feb 16, 2020

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