Learn

Friday, 9 October

JEE Main 2020 · MathsMultiple choiceSingle correctMediumCalculation

JEE Main 6 September 2020, Shift 2, Maths Q55

Question 55 of 75 in this shift, Maths question 5 of 25.

If the constant term in the binomial expansion of (x−kx2)10\left(\sqrt{x}-\frac{k}{x^2}\right)^{10} is 405, then ∣k∣|k| equals :
  1. (1)1
  2. (2)3Official answer
  3. (3)2
  4. (4)9

Official answer

Option 2

NTA final key (Sep 2020).

Chapter
Binomial Theorem
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.