GO Classes 2023 | Weekly Quiz 5 | Question: 6

Answer 1

$\text{Case 1:}$ Boy has black hair, Girl has white hair :
In this case, no one is lying, But we know at least one of them is lying, So, this case is not possible.

$\text{Case 2:}$ Boy has white hair, Girl has black hair :
Now, both are lying.

So, both are lying.

Detailed Video Solution: https://youtu.be/nclBhBmtz2g?t=2299