# If 1 00 2 10 321 A é ù ê ú = ê ú ê ú ë û – and 1 00 210 7 21 B é ù ê ú = -ê ú ê ú ë û – then AB equals

Question:

If $A=\left[\begin{array}{ccc}1 & 0 & 0 \\ 2 & 1 & 0 \\ -3 & 2 & 1\end{array}\right]$ and $B=\left[\begin{array}{ccc}1 & 0 & 0 \\ -2 & 1 & 0 \\ 7 & -2 & 1\end{array}\right]$ then $A B$ equals

1. $I$

2. $A$

3. $B$

4. 0

Correct Option: 1

JEE Main Previous Year 1 Question of JEE Main from Mathematics Inverse Trigonometric Functions chapter.
JEE Main Previous Year Online May 26, 2012

Solution:

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