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Unit digit of a single power a^n (cycle of 4)

The same question, asked 4 times: CDS 2 2016*, CDS 2 2019*, CDS 2 2020*, CDS 1 2021. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    CDS 2 2016

    33
    What is the unit digit of 71397^{139} ?

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  2. Question 2

    CDS 2 2019

    19
    What is the unit place digit in the expansion of 7737^{73} ?

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  3. Question 3

    CDS 2 2020

    8
    What is the digit in the unit place of 3993^{99} ?

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  4. Question 4

    CDS 1 2021

    9
    What is the unit digit in the expansion of 673267^{32}?

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