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Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the one that is different.
From the above Option we check
Option (B) 31-41
41-31= 10
Option (C)61-71
71-61 = 10
Option (D)83-97
97-83 = 14
Option (A) 73-79
79-73 = 6
from the above Option B, C, D is the difference is two-digit But Option (A) is difference single digit
therefore Option (A) 73-79 Ans
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