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ISRO 2006- ECE Boolean algebra

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Option C  

A(BC+D)

If A is open No flow is present towards Y So A=1

Since BC Both has to close to have the flow towards Y

Y has output if both B=1 and C=1 so BC

All ABC =1 to have flow towards Y

we can have AD 2nd way of flow in circuit 

So ABC+AD =Y

A(BC+D) =Y

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