What's wrong  Spot the mistake in the calculation at two different difficulty levels

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What’s wrong with 1U x 2 3 4 5          A          B

What’s wrong with 1U x U          A          B

What’s wrong with TU x 2 3 4 5          A          B

What’s wrong with TU x U          A          B

What’s wrong with 1TU x U          A          B

What’s wrong with HTU x U          A          B

Generation Grids Problem          1U x U          TU x U          HTU x U          TU x TU

 

What’s wrong with TU x TU     A     B