In the following circuit,the value of Y

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is 0

is 1

fluctuates between 0 and 1

is indeterminate as the circuit can't be realised

answer is A.

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Detailed Solution

Lower NOT gate inverts input 1 to zero. NOT gate and NAND gate inverts this output 0 to Upper NAND gate converts this output 1 and input 0 to 1. Thus A = 1 and B = 1 become inputs of NAND gate giving final output as zero. Choice (1) is correct.

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