ISRO2008-26

Question

The logic operations of two combinational circuits in Figure-I and Figure -II are

• A. entirely different
• B. identical
• C. complementary
• D. dual

Comments

Bubbles in the immediate vicinity of Logic Gates are NOT operation; while other bubbles are the symbolic representations of an input or an output.

Answer 1

Answer :A

Figure : 1

(x + y')' ===> [ (x + (x + y')']'   ===> x'(x+y') ===>xx' + x'y' ===> x'y'

Figure  : 2

xy'

Entirely different

Comments

Figure : 1

(x+(x + y')')'=x'.(x+y')=x'y'

Figure  : 2

xy'

Ans.A   entirely different

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Thanks for comment .I made a correction in my answer.

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How complement and dual different from each other

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Although the answer is still same but a small confusion in the diagram ? 

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dear @reena  these are the represent of i/p and o/p  otherwise u tell me what is the meaning of 'o' used at o/p side. so it is  just way  represent of i/p and o/p

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X only

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@srestha plz help ma'am..confusing

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all round figure is  a NOT, so it will be X'

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then answer for figure 2 shoulde be X+Y'