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 from the rest.
120 : 300 = 30 x 4 : 30 x 10
28 : 70 = 7 x 4 : 7 x 10
16 : 40 = 4 x 4 : 4 x 10
320 : 480 = 80 x 4 : 80 x 6
All number-pairs except 320 : 480 are 4th and 6th multiples of a number
$$\therefore\ $$320 : 480 is the odd one among the given number-pairs
Hence, the correct answer is Option C
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