Untitled

<!DOCTYPE html>
<html>
<head>
<meta name="description" content="[add your bin description]">
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
var alphabeticArr = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"];
var numericArr = [0,1,2,4,5,6,7,8,9];


function combinations(arr, n) {
	var i, j, combs, head, tailcombs;


	if (n > arr.length || n <= 0) {
		return [];
	}


	if (n == arr.length) {
		return [arr];
	}


	if (n == 1) {
		combs = [];
		for (i = 0; i < arr.length; i++) {
			combs.push([arr[i]]);
		}
		return combs;
	}

	combs = [];
	for (i = 0; i < arr.length - n + 1; i++) {
        head = arr.slice(i, i + 1);
        tailcombs = combinations(arr.slice(i + 1), n - 1);

		for (j = 0; j < tailcombs.length; j++) {
			combs.push(head.concat(tailcombs[j]));
		}
	}
	return combs;
}


var empty = [];
var numComb  = combinations(numericArr, 3);
var alphabecticComb = combinations(alphabeticArr, 3);

for (var x = 0; x <numComb.length; x++){
  for(var y = 0; y < alphabecticComb.length; y++){
    for(var z =0; z <numComb.length; z++){
      empty.push(`${numComb[x]}-${alphabecticComb[y]}-${numComb[z]}`)
    }
  }
}

console.log(empty.length);
</script>


<script id="jsbin-source-javascript" type="text/javascript">


var alphabeticArr = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"];
var numericArr = [0,1,2,4,5,6,7,8,9];


function combinations(arr, n) {
	var i, j, combs, head, tailcombs;


	if (n > arr.length || n <= 0) {
		return [];
	}


	if (n == arr.length) {
		return [arr];
	}


	if (n == 1) {
		combs = [];
		for (i = 0; i < arr.length; i++) {
			combs.push([arr[i]]);
		}
		return combs;
	}

	combs = [];
	for (i = 0; i < arr.length - n + 1; i++) {
        head = arr.slice(i, i + 1);
        tailcombs = combinations(arr.slice(i + 1), n - 1);

		for (j = 0; j < tailcombs.length; j++) {
			combs.push(head.concat(tailcombs[j]));
		}
	}
	return combs;
}


var empty = [];
var numComb  = combinations(numericArr, 3);
var alphabecticComb = combinations(alphabeticArr, 3);

for (var x = 0; x <numComb.length; x++){
  for(var y = 0; y < alphabecticComb.length; y++){
    for(var z =0; z <numComb.length; z++){
      empty.push(`${numComb[x]}-${alphabecticComb[y]}-${numComb[z]}`)
    }
  }
}

console.log(empty.length);
</script></body>
</html>