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2015-06-25T16:24:21+05:30

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6^1  = 6\\ 6^2 = 36\\ 6^3 = 216...

The unit digit is always 6. 

So unit digit of 6^100 is 6.
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2015-06-25T16:32:51+05:30

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6²=36 6³=216 6^4=1296 6^5=7776 Here in every unit digit place is 6........... So. In 6^100 there is also 6 in unit place
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