Check whether 3 nums are evenly spaced. E.g. Get the smallest, and largest numbers and use them to calculate the medium, then return whether the diff from mid to small equals the diff from large to mid.

evenlySpaced.java

public boolean evenlySpaced(int a, int b, int c) {
  int sm = Math.min(Math.min(a, b), c);
  int lg = Math.max(Math.max(a, b), c);
  //int md = (a+b+c) - (Math.min(Math.min(a,b),c) + Math.max(Math.max(a,b),c));
  int md = (a+b+c)-(sm+lg);
  
  
  return md-sm == lg-md;
}