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I have understood solution of book as he has used exclusive Nor gates.
But lets suppose somebody is not knowing abt gates, how he will start to solve this question on paper. i mean how to make its table. i am confused abt it.
A point of clarification. The gates on the left of your diagram are NOT xor gates, they are Ex-NOR gates. That being said, the truth table that Colbhaidh listed is correct for the Ex-NOR gate.
Here is an interactive comparator you can play around with: **broken link removed**. The circuit is different from yours, but the article should help you see things.
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