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OpenStudy (anonymous):
Find the units digit of (867)^5309.Please show me how to do.
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OpenStudy (anonymous):
Could you please help me without calculator
OpenStudy (anonymous):
please show me the steps
OpenStudy (anonymous):
Do you know modular arithmetic?
OpenStudy (anonymous):
no
OpenStudy (anonymous):
hmm....then you need to be a little clever and observant. My suggestion is to check the units digits of:\[7^1,7^2,7^3,7^4,7^5,7^6\]and see if you can spot a pattern.
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OpenStudy (anonymous):
this problem is from 8th grade math tournament .without calculator.
OpenStudy (anonymous):
i need help
OpenStudy (anonymous):
try my suggestion.
OpenStudy (anonymous):
okay .thanks
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