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Easy

Question

# A and B are two given matrices such that the order of A is 3 × 4, If A'B and BA' are both defined then:

- order of B' is 3 × 4
- order of B'A is 4 × 4
- order of B'A is 3 × 3
- B'A is not defined

## The correct answer is: order of B'A is 4 × 4

### Let order of B is m × n

A'B is define so m = 3

BA' is define so n = 4

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