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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

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OR
Output of OR gate is 0 when all inputs are $0 \&$ output is 1 when atleast one of the input is 1. Observing output $x$ :- It is 0 when all inputs are $0 \&$ it is 1 when atleast one of the inputs is $1 . \therefore$ OR gate
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