2013 · Q32
What is the last digit in 7^402 + 3^402?
Elementary MathematicsNumber System
- A0
- B4
- C8
- DNone of the above
Explanation
7^4≡1, 3^4≡1 mod 10; 7^402→9, 3^402→9; sum→8. Answer C.
What is the last digit in 7^402 + 3^402?
Explanation
7^4≡1, 3^4≡1 mod 10; 7^402→9, 3^402→9; sum→8. Answer C.