What is the unit digit of \(7^{4}\)?
Answer: D
We look at the pattern of the unit digits of powers of 7. \(7^1=7\), \(7^2=49\) (unit digit 9), \(7^3=343\) (unit digit 3), \(7^4=2401\) (unit digit 1). The unit digit of \(7^4\) is 1.