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9. Consider the numbers 7 x 7,7 7 x 7,7 x 7 x 7 x 7,7 x 7 x 7 x 7 x 7.
Find the right-most digit of each of these numbers. What do you observe? Based on your
observation, find the right-most digit of the number 7 x 7 x 7 x 7.......... 11 times.
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