Three of the following four number-pairs are like in a certain way and one is different. Pick the number-pair that is different from the rest.
From the given terms,
13 : 171 is related as $$13^2+2=171$$
8: 66 is related as $$8^2+2=66$$
7: 51 is related as $$7^2+2=51$$
10 : 98 is related as $$10^2-2=98$$
Hence, option D is different from the rest of the terms.
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