function deleteNth(arr,n){
  arr.forEach(function (item, index) {
  var count = 0;
  for (var i = 0; i < arr.length; i++) {
    if (arr[i] === item) {
    count++;
    while (count > n) {
    var remove = arr.lastIndexOf(item);
     arr.splice(remove, 1);
     count--;
}
}
}
});
  return arr;
}

deleteNth([7, 26, 21, 41, 43, 2, 26, 24, 10, 26, 10, 10, 24, 35, 35,
35, 43, 26, 41, 7, 24, 24, 21, 24, 10, 35, 10, 7, 24, 7, 35, 26, 41,
35, 2, 43, 24, 2, 41, 26, 41, 7, 7, 26, 2, 10, 43, 10, 35, 41, 24, 7,
2, 2, 7, 2, 26, 24, 26, 43, 43, 21, 10, 28, 10], 2)

[7, 26, 21, 41, 43, 2, 26, 24, 10, 10, 10, 24, 35, 35, 43, 41, 7, 21,
41, 2, 43, 28]

[7, 26, 21, 41, 43, 2, 26, 24, 10, 10, 24, 35, 35, 43, 41, 7, 21, 2,
28]