can't make a tripleTheChances function work

Question

I've been trying to resolve this for a while. I already know that a simple .map would work, but I would like to know how I can do it in other ways like using for. here's what i have to do. 1-receive an arg: chances and an array of inter. 2-returns an array of inters * 3.

const tripleTheChances = function (chances) {
  n = 0;
  for (let i = 0; i < chances.length; i++);
  n = n[chances] * 3;
  return n;
};
let arr = [2, 4, 6];
console.log(tripleTheChances(arr));