First i would suggest to watch its conceptual (previous videos on concept below link) videos and then watch it.
In this video you will get the complete solution of jee main Q90 based on Mathematical Reasoning.
After watching the complete video you may ask in the comment box.
Thanks for watching.
Mathematical Reasoning Concepts-
Part1 -https://youtu.be/NwGjb5HGBzQ
Part2- https://youtu.be/jj4lHHZiEYA
Part3 -https://youtu.be/KwSbhbcAC78
Part4- https://youtu.be/Qt4j4Xt8lIA
Part5- https://youtu.be/hqRate3S1Uk
Part6 – https://youtu.be/zWgI40sQy3s
Other suggested videos-
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What is CGPA -https://youtu.be/34QAxJjU0vQ
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10 ka dum-https://youtu.be/7MWcW6PA148
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You’re doing great. Keep up the hard work.. 👍🏻🙂