Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different.
31 $$\times$$ 7 - 3 = 217 - 3 = 214
37 $$\times$$ 7 - 3 = 259 - 3 = 256
21 $$\times$$ 7 - 3 = 147 - 3 = 144
39 $$\times$$ 7 - 3 = 273 - 3 = 270
$$\therefore$$ The correct answer is option C.
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