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Question

Find the unit digit of 124128 × 126124

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Solution

In 124128, the unit digit of base 124 is 4 and the power is 128 (even power).
Therefore, unit digit of 124128 is 4.
Also in 126124, the unit digit of base 126 is 6 and the. power is 124 (even power).
Therefore, unit digit of 126124 is 6.
Product of the unit digits = 6 × 6 = 36
∴ Unit digit of the 124128 × 126124 is 6.


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