Department Numbers solution

What is your hint or solution suggestion?

function combinations(possibleNumbers, total) {
  let validPerms = [];
  let permutations = [];
  genPerm(permutations, possibleNumbers, [], 3);
  console.log(`permutations size ${permutations.length}`)
  for(let i = 0; i < permutations.length; i++){
    let permutation = permutations[i];
    if(permutation[0] % 2 == 0){
      if(permutation.reduce((acc, elem) => acc + elem) == total){

  return validPerms;

function genPerm(acc, options, current, size){
  if(current.length < size){
    for(let i = 0; i < options.length; i++){
      let remainingOptions = options.toSpliced(i, 1);
      let clone = current.slice();
      genPerm(acc, remainingOptions, clone, size);
  } else {

Challenge: Department Numbers

Link to the challenge:

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