A+b+c+d=0 then find (a+d)^2+(b+d)^2+(c+d)^2/
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a+b+c+d=0
we can put the values
a=c=1 & b=d=-1
(1-1)^2 + (-1-1)^2 + (1-1)^2
(-2)^2
4 ans.
we can put the values
a=c=1 & b=d=-1
(1-1)^2 + (-1-1)^2 + (1-1)^2
(-2)^2
4 ans.
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