Write last two digit of number 3^400
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3^0=1
3^1=3
3^2=9
3^3=27
3^4=81
3^5=243
you can see after 3^3 the unit digit are repeat so divide power 400 by 4
4 time different unit digit
400/4=100
there are no remitter so 3^0=1
last digit =1
3^1=3
3^2=9
3^3=27
3^4=81
3^5=243
you can see after 3^3 the unit digit are repeat so divide power 400 by 4
4 time different unit digit
400/4=100
there are no remitter so 3^0=1
last digit =1
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