This solution is wrong bcoz if both are lying then how it could be possible that they are lying about same thing?
Hello
That's not the question.
The question is, when do they agree. Not when they both say true.
They both can agree when -
Please check the video https://www.teachoo.com/10901/3128/Question-26/category/CBSE-Class-12-Sample-Paper-for-2020-Boards/