Question

What is the unit digit of ${23}^{47}$ ?

• A. 3
• B. 9
• C. 7
• D. 1

Answer 1

The correct option is C 7

The base here is 23, which has 3 as the unit digit. When we find the remainder of the power by 4, we get the remainder as 3. So, the unit digit of ${23}^{47}$ will be same as the unit digit of $3^3$ i.e.7.