UPSKILL MATH PLUS

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Answer variants:
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What could be the possible ‘one’s’ digits of the square root of each of the following numbers?
 
1. 9801
 
The unit digit of the square root of 9801 is either
 or
.
 
 
2. 99856
 
The unit digit of the square of 99856 is either
or
.
 
[Note: Enter the answer in the ascending order.]