Encircle the odd one of the following.
(-3,3)
(-5,5)
(-6,1)
(-8,8)
Adding the coordinates of each option, we get
(A)⇒–3+3=0(B)⇒–5+5=0(C)⇒–6+1=-5(D)⇒–8+8=0
Here, (A)=(B)=(D)=0
Hence, option (C) is the odd one.