12 42 06
42 75 30
81 ? 163
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These questions can look very difficult, sometimes even not solvable. This would be true if you hadn’t read this article! If you take a careful look at the given set of numbers, you will find that they are related to a rule. The sum of all digits is 30 in both the numbers. There is no other relation between the two numbers. So start checking the options. You may want to save time and argue that you only need to check the first number of the given pairs. But that would be wrong and dangerous. What if the options followed the rule that the pair should have the same sum of the digits, even if it is different than 30? That said, you should ideally check both the numbers.
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