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Question

What is the  unit digit in `(4137)^754`  ?


Options:
A .  1
B .  3
C .  7
D .  9
Answer: Option D

Unit digit in `(4137)^754`  =  Unit digit in {`{(4137^4)}^188`  x  `(4137)^2` }  = ( 1 x 9 ) = 9.




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