Answer / ashish

yeh,its 1111
suppose A=1010
nA=0101
A+nA=1111

Answer / guest

1111

Answer / ramanareddy

let A=0000
~A=1111
A+~A=1111=~A
now let A=1111
~A =0000
A+~A=1111=A
so either A or ~A

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