In the official answer key, question number is given and the respective correct answers are written but if you are facing problem while comparing those answers with your responses in that case, you can download answer keys of renowned coaching centres like Resonance, Allen kota, Akaash Institute, Sri Chaitanya etc. These answer keys are available along with the question so there won't be any problem. Adding to this, being top notch educational centres, mistakes are comparatively less. Answers are quite genuine. You can download these answer keys and then compare the answers with the official one. I'm attaching a link here from where you can download the answer keys of Resonance, Allen Kota etc. http://engineering.careers360.com/articles/jee-advanced-answer-key Jee Advanced 2020 official answer keys are also available in the link.

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