X-NOR gate.

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The output of x-nor gate is in state 1 only when it's two inputs are at the same states with respect to each other. X-NOR gate is also known as exclusive nor gate or E-NOR gate. It is a digital logic gate which is the reverse or complementary or inverse form of xor gate. X-NOR gate is the combination of xor and not gate.
The logic symbol for x-nor gate is shown in the figure

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