diff --git a/src/factorial.js b/src/factorial.js
index 4f3ae70..e64cb61 100644
--- a/src/factorial.js
+++ b/src/factorial.js
@@ -1,5 +1,9 @@
 const factorial = (number) => {
-  // your code here
+  var valor = 1;
+  for( var i=number;i>0;i--) {
+    valor *= i;
+  }
+  return valor;
 }
 
-module.exports = factorial;
\ No newline at end of file
+module.exports = factorial;
diff --git a/src/fibonacci.js b/src/fibonacci.js
index ea3270f..b759d91 100644
--- a/src/fibonacci.js
+++ b/src/fibonacci.js
@@ -1,5 +1,17 @@
 const fibonacci = (n) => {
-  // your code here
+  var lista = new Array;
+  var anterior = 0;
+  var siguiente = 1;
+  var numero = 0;
+  lista.push(1)
+//    for( ;lista.length<n;) {
+  while(lista.length<n) {
+    numero = anterior + siguiente;
+    anterior = siguiente;
+    siguiente = numero;
+    lista.push(numero)
+  }
+  return lista;
 }
 
-module.exports = fibonacci;
\ No newline at end of file
+module.exports = fibonacci;
diff --git a/src/primalidad.js b/src/primalidad.js
index 8bdb849..1a2ec4c 100644
--- a/src/primalidad.js
+++ b/src/primalidad.js
@@ -1,5 +1,22 @@
 const trialDivision = (number) => {
-  // your code here
+  var valor = true;
+  if (number == 1 || !Number.isInteger(number) )
+    valor = false;
+  else {
+    var valor = (number>1);
+    for( var i=2;i<number;i++) {
+      for(var j=2;j<number;j++)
+      {
+        if (i*j == number) {
+          valor = false;
+          break;
+        }
+      }
+      if (valor==false)
+      break;
+    }
+  }
+  return valor;
 }
 
-module.exports = trialDivision;
\ No newline at end of file
+module.exports = trialDivision;