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.
In 4209 : 15
4 + 2 + 0 + 9 = 15
In 5121 : 12
5 +Â 1 +Â 2 +Â 1 = 9
In 8101 : 10,
8 + 1 + 0 + 1 = 10
In 7456 : 22,
7 + 4 + 5 + 6 = 22
$$\therefore$$ The correct answer is option B.
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