Discussion

Explanation:

Each of them alone saw 1 bird.

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Each pair saw 1 bird which the third did not see.

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All three of them saw 1 bird.

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Chetan saw 4 yellow birds, hence all 4 birds that Chetan saw were yellow. 

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Abdul saw only 2 yellow birds while Mala saw 3 yellow birds. Hence, the third yellow bird which Mala saw was seen by Mala alone.

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There are a total of 5 yellow birds.

Hence, 5.

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