How many yellow birds were seen in all?
Explanation:
Each of them alone saw 1 bird.
Each pair saw 1 bird which the third did not see.
All three of them saw 1 bird.
Chetan saw 4 yellow birds, hence all 4 birds that Chetan saw were yellow.
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.
There are a total of 5 yellow birds.
Hence, 5.
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