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Verified Answer :

clache

6,2,8,4,and 0 are the only possible value of the ones digit, because 
61=6, last digit is 6
62=12, last digit is 2
63=18, last digit is 8
64=24, last digit is 4
65=30, last digit is 0
66=36, last digit is 6
and the whole cycle goes over again.

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