2009 · Q99
What is the last digit in the expansion of (2457) 754 ?
Elementary MathematicsNumber System
- A3
- B7
- C8
- D9
Explanation
7⁴ ≡ 1 mod 10; 754 ≡ 2 mod 4, so last digit is 9.
What is the last digit in the expansion of (2457) 754 ?
Explanation
7⁴ ≡ 1 mod 10; 754 ≡ 2 mod 4, so last digit is 9.