AP ICET 2014

Question 109

The digit in the units place of the number $$13^{400}$$ is

Solution

The cyclicity of 13 is 4. Now 400 is perfectly divisible by 4. Hence units digit of $$13^{400}$$ is equivalent to $$13^{4}$$ which is equal to 1.

Hence, the correct answer is Option D


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