Doubt from logic gates

Q:12
Pls Explain what is reversible gates?

As it is explained in solution, we need that logic gate from whose output we can find out input.
In NOT gate output is just opposite of the input. So it can be considered as reversible logic gate.

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So it means reversible operation can only be done when there is one input....or similar inputs(because when we have two diff input which gives output like other three options we cannot find the input ?

Actually I had got the same question in test series, so didn't go in depth because not many questions are asked.

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For me it came in my mains so only I asked😅
Ok :+1:t2:

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