Problem C. 1268. (January 2015)
C. 1268. Prove that for all real numbers \(\displaystyle a\) and \(\displaystyle b\), \(\displaystyle a^4+b^4+2\ge 4ab\).
(5 pont)
Deadline expired on 10 February 2015.
Statistics:
159 students sent a solution.  
5 points:  94 students. 
4 points:  31 students. 
3 points:  13 students. 
2 points:  11 students. 
1 point:  3 students. 
0 point:  2 students. 
Unfair, not evaluated:  5 solutions. 
