Question

unit digit of 3157 raised to the power 20 20​

Answer 1

Answer:

The unit digit would be 1.

Step-by-step explanation:

Given number,

$3157^{20}$

Since, ones place digits are,

$7^1 = 7$

$7^2 = 9$

$7^3 = 3$

$7^4 = 1$

We can write,

$3157^{20}=3157^{4\times 5}=(3157^4)^5=1^5=1$

Hence, the unit digit in the given expression would be 1.