Question

What is the unit digit of 4power2020

Answer 1

Answer:

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Step-by-step explanation:

Divide the exponent 'y' by 4.

If the exponent y is exactly divisible by 4. i.e, y leaves a remainder 0 when divided by 4. Then, the units digit of xy is 6, if l = 2, 4, 6, 8. ...

If y leaves a non-zero remainder r, when divided by 4 (i.e y = 4k + r). Then, the units digit of xy = lr.