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Wave Optics
If a, b, c, d are inputs to a gate and x is its output, then, as per the following time graph, the gate is:
NOT
AND
OR
NAND
C.
OR
The output of OR gate is 0 when all inputs are 0 and output is 1 when at least one of the input is 1.
Observing output x it is 0 when all inputs are 0 and it is 1 when at least one of the inputs is 1.
therefore, the gate is OR
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