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If a, b, c, d are inputs to a gate and is its output, then, as per the following time graph, the gate is:

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Verified Answer
The correct answer is:
OR
| a | b | c | d | X |
| 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 1 | 1 |
When any input is one output is one hence the gate is 'OR' gate.
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