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The combination of gates shown in figure yields.

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NAND gate

OR gate

NOT gate

XOR gate

answer is B.

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Detailed Solution

If the inputs A and B are inverted and then applied to a NAND gate, the output of the NAND gate will be the same as that of an OR gate. The input of the last NAND gate is A.A and B.B. Hence the correct choice is (b)

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