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Quantitative Aptitude

Unit Digit of a Number

Find the unit...

Question

$F i n d t h e u n i t d i g i t o f 217^{434} A n s .$ ______________.

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Solution

$U n i t d i g i t o f 217^{4 n + 1} = 7, U n i t d i g i t o f 217^{4 n + 2} = 9, U n i t d i g i t o f 217^{4 n + 3} = 3, U n i t d i g i t o f 217^{4 n} = 1.$

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