What is the unit digit of $(6^{28} - 3^{22})$ ?

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Solution

The correct option is A 7
Unit digit of $6^{28}$ is 6 and unit digit of $3^{22}$ is 9 (since $22 = 4 k + 2$ ). So, unit digit of given expression is $(16 - 9) = 7$ .

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