What's the O() - Big "Oh" runtime of the code fragment in terms of n:

3. What's the O0 - Big "Oh" runtime of the code fragment in terms of n: a, int x = 0; for (int i = n; i >= 0; i--) if ( (i % 3) 0) break ; else x += n; b, int x = 0; for(int i =0; i