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Q.

The circuit diagram (see figure) shows a 'logic combination' with the states outputs X, Y and Z given for inputs P, Q R and S  all at state 1 (i.e., high). When inputs P and R change to state 0 (i.e., low) with inputs Q and S still at 1, the condition of output X , Y and Z changes to

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a

X-1; Y-0; Z-0

b

X-1; Y-1; Z-1

c

X-0; Y-1; Z-0

d

X-0; Y-0; Z-1

answer is C.

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Detailed Solution

The following arguments shall help us to arrive at the right choice.AND gate shall not respond to zero input.Since R is zero and S is1 therefore NOR gate gives zero. NOT gives 'l ' correspond to 0.NOR gate would not respond to 0 and 1.
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