Matrices - Online Test

Matrices TEST : 6

# Matrices # CBSE 12th Mathematics Prepare / Learn

Q1. If A and B are square matrices of the same order and AB = 3 I, then

A^{- 1}

is equal to

A. 3B−1

B. 1/3B

C. 3B

D. none of these.

Answer : Option B
Explaination / Solution:

If A and B are square matrices of the same order and AB = 3 I, then ,

\frac{1}{3} A B = I A^{- 1} = \frac{1}{3} B .

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