Problem
NT-B1-M11-P005 Last Digit
#5
★☆☆☆☆ Level 1 of 5
Find the last digit of \(7^{2025}\).
The last digits of powers of \(7\) have period \(4\).
The last digits are \(7,9,3,1\). Since \(2025\equiv1\pmod4\), the last digit is \(7\).
Simple power cycle.