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Quantitative Aptitude

Unit Digit of a Number

Find the unit...

Question

$F i n d t h e u n i t d i g i t o f 123^{456} A n s .$ ______________.

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Solution

Unit digit of $123^{4 n + 1}$ = 3, Unit digit of $123^{4 n + 2}$ = 9, Unit digit of $123^{4 n + 3}$ = 7, Unit digit of $123^{4 n}$ = 1. Unit digit of $123^{456}$ = 1.

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