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Q.

In the following circuit,the value of Y

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a

is 0

b

is 1

c

fluctuates between 0 and 1

d

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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