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What is the probability that 4th power of an integer chosen randomly ends with the digit 6.

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The final digit of any power of an integer relies solely on the final digit of the original integer itself.

We have the following:

Since each final digit of the original integer is equally likely, the probability that the fourth power of a randomly selected integer being 6 will be 

#of choices that lead to final digit being 6 / #of choices regardless = 4/10 = 40 % 

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Can you just explain the above table in detail

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