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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
$therefore$ A'B is define so m = 3
$therefore$ BA' is define so n = 4

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