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Question

If A=[123425] and B=234521, then

A
AB, BA exist and equal
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B
AB, BA exist and are not equal
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C
AB exists and BA does not exist
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D
AB does not exist and BA exists
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Solution

The correct option is B AB, BA exist and are not equal
Since, we have A=2×3,B=3×2
So, both AB and BA exist.
But both are not equal to each other because bith are if different order
AB2×2 and BA3×3.

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