Problem C. 1273. (February 2015)
C. 1273. Prove that \(\displaystyle 3^{4n}+4\cdot 7^{4k}\) is divisible by 5 for all \(\displaystyle n,k\in \mathbb{N}\).
(5 pont)
Deadline expired on March 10, 2015.
Statistics:
144 students sent a solution. 5 points: 54 students. 4 points: 45 students. 3 points: 37 students. 2 points: 5 students. 1 point: 1 student. 0 point: 2 students.
Problems in Mathematics of KöMaL, February 2015