What is the unit digit in 189^723? A] 7 B] 9 C] 1 D] 3 Options : A B C D
Question
Solution 1
The unit digit of any number powered by 189 will always be the same as the unit digit of 189 raised to the power of the unit digit of the other number. In this case, the other number is 723, so we need to find the unit digit of 189^3.
The unit digit of 189 is 9.
The unit digit of 9^3 (729) is 9.
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