Question

What is the unit digit of 27 power 20?

Answer 1

Answer:

Unit digit of 27^1 =7 ( 7^1 =7)

,, ,, ,,, 27^2 =9 (7^2 =49)

UD of 27^3 =3 (7^3 =343)

UD of 27^4=1 (7^4=2401)

Hence for every four consecutive powers, the unit digit will follow a pattern of 7,9,3,1.

Hence UD of 27^20 will be 1.

Step-by-step explanation:

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Answer 2

The unit digit of the whole expression is 1.

Given:

${27}^{20}$

To find:

The unit digit.

Solution:

To determine the unit digit of the above number we have to follow the below steps as follows-

The given number is

${27}^{20}$

Here 27 has the unit digit 7.

Again if we divide 20 by 4 we will get 0 as a reminder.

Thus here reminder is 0 and the unit digit of 27 is 7 so, the unit digit of the whole expression is 1.

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