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# Brent, Corrigan and Bieber went out to birdwatching. Each one saw a bird that no one else did. Each pair between them saw a bird that the th

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Brent, Corrigan and Bieber went out to birdwatching. Each one saw a bird that no one else did. Each pair between them saw a bird that the third didn't. Finally, one bird was seen by everyone. From the birds Brent saw, 2 were yellow. From the birds Corrigan saw, 3 were yellow. From the birds Bieber saw, 4 were yellow.

How many yellow birds were seen altogether?
How many birds with other colors were seen altogether?

Nov 7, 2014

#9
+98173
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All saw yellow bird 5

Bierber saw 4 yellow birds, yellow bird 4 was seen by him only, yellow bird 2 was seen by him and Brent and not seen by Corrigan, yellow bird 3 was seen by him and Corrigan and not seen by Brent

Corrigan saw 3 yellow birds and one non-yelllow bird. He and Bieber see yellow bird 3 that was not seen by Brent. He and Brent see non-yellow bird 2 that is not seen by Bieber.

Brent saw 2 yellow and 2 non-yellow birds. He sees non-yellow bird 1 that is not seen by the others.

5 yellow birds were seen....2 non-yellow birds were seen.

Nov 7, 2014

#1
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5 yellow birds.  2 other colored

Nov 7, 2014
#2
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you were wrong

Nov 7, 2014
#3
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How?  Each saw 1 bird the other didn't.  3 birds witnesses.  Each pair saw a bird the other didn't. 6 more witnesses. They all finally saw one bird.  3 witnesses.  They all saw 4 birds.  What did I do wrong?

Nov 7, 2014
#4
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you forgot to add in the yellow birds that were seen by more than one person

Nov 7, 2014
#5
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Okay.  I see.  Read it wrong. Thanks. I'll edit.

Nov 7, 2014
#6
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Nov 7, 2014
#7
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yes much better now it is correct

Nov 7, 2014
#8
+7188
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Nov 7, 2014
#9
+98173
+13

All saw yellow bird 5

Bierber saw 4 yellow birds, yellow bird 4 was seen by him only, yellow bird 2 was seen by him and Brent and not seen by Corrigan, yellow bird 3 was seen by him and Corrigan and not seen by Brent

Corrigan saw 3 yellow birds and one non-yelllow bird. He and Bieber see yellow bird 3 that was not seen by Brent. He and Brent see non-yellow bird 2 that is not seen by Bieber.

Brent saw 2 yellow and 2 non-yellow birds. He sees non-yellow bird 1 that is not seen by the others.

5 yellow birds were seen....2 non-yellow birds were seen.

CPhill Nov 7, 2014