a) 3
b) 4
c) 5
d) 6
Answer: a
Explanation: When the birds sat one on a branch, there was one extra bird.
When they sat Two to a branch one branch was extra.
Go through the options one by one;
Checking option (a);
If there were 3 branches, there would be 4 birds.
(This would leave one bird without branch as per the question)
When 4 birds would sit Two to a branch there would be one branch free
(as per the question).
The option ‘a’ is correct.
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