Number System
What should be the least number to be added to the 51234 number to make it divisible by 9?

5
6
4
3

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Number System
In a two-digit number, if it is known that its unit's digit exceeds its ten's digit by 2 and that the product of the given number and the sum of its digits is equal to 144, then the number is:

26
42
46
24

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