Encircle the odd one of the following :
(a) (–1, –2) (b) (–5, +2) (c) (–4, +1) (d) (–9, +7)
(d)
(a) -1-2=-3 (b) -5+2=-3 (c) -4+1=-3 (d) -9+7=-2 (-9,+7) is different from other options.
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