JEE Main 2015MathematicsMatricesMediumMCQ

JEE Main 2015 — Matrices Question with Solution

JEE Main 2015 (11 Apr Online)

Question

If A is a  3×3 matrix such that 5 adjA=5, then A is equal to

Choose an option

Show full solutionCorrect option: C
Correct answer
C±15

Step-by-step explanation

5 Adj A=5

125 |adj A|=5

Since [A] is 3×3

adj A=125

A2=125

A= ±15.

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About this question

This is a previous-year question from JEE Main 2015, covering the Matrices chapter of Mathematics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.