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Friday, 9 October

JEE Main 2021 · MathsMultiple choiceSingle correctEasyCalculation

JEE Main 18 March 2021, Shift 1, Maths Q63

Question 63 of 90 in this shift, Maths question 3 of 30, Section A.

Let A+2B=[1206−33−531]A+2B=\begin{bmatrix}1&2&0\\6&-3&3\\-5&3&1\end{bmatrix} and 2A−B=[2−152−16012]2A-B=\begin{bmatrix}2&-1&5\\2&-1&6\\0&1&2\end{bmatrix}. If Tr(A) denotes the sum of all diagonal elements of the matrix A, then Tr(A) −- Tr(B) has value equal to :
  1. (1)1
  2. (2)2Official answer
  3. (3)3
  4. (4)0

Official answer

Option 2

NTA final key.

Chapter
Matrices
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.