diff --git a/src/factorial.js b/src/factorial.js
index 4f3ae70..f16f3c5 100644
--- a/src/factorial.js
+++ b/src/factorial.js
@@ -1,5 +1,18 @@
 const factorial = (number) => {
-  // your code here
+  // Excepcion para 0
+  if(number == 0){
+    return 1;
+  }
+
+  var res = number;
+
+  while(number>1){
+    res = res*(number-1);
+    number--;
+  }
+
+  return res;
+  // \_0>
 }
 
 module.exports = factorial;
\ No newline at end of file
diff --git a/src/fibonacci.js b/src/fibonacci.js
index ea3270f..0744afa 100644
--- a/src/fibonacci.js
+++ b/src/fibonacci.js
@@ -1,5 +1,17 @@
 const fibonacci = (n) => {
-  // your code here
+  var res = [];
+  var a = b = 1;
+
+  res.push(a)
+
+  for(var i=0; i<(n-1); i++){
+    b = a+b;
+    a = b-a;
+    res.push(a);
+  }
+  
+  return res;
+  // \_0>
 }
 
 module.exports = fibonacci;
\ No newline at end of file
diff --git a/src/primalidad.js b/src/primalidad.js
index 8bdb849..9f0d112 100644
--- a/src/primalidad.js
+++ b/src/primalidad.js
@@ -1,5 +1,27 @@
 const trialDivision = (number) => {
-  // your code here
+  // Excepcion para <=1 y float
+  if((number <= 1) || (number%1 !== 0)){
+    return false;
+  }
+
+  // Probar para (n/2)+1 no tiene sentido.
+  if(number == 2){
+    return true;
+  }
+
+  var esPrimo = true;
+  var n = Math.floor(number/2)
+
+  while(n>1){
+    if(number%n == 0){
+      esPrimo = false;
+      break;
+    }
+    n--;
+  }
+
+  return esPrimo
+  // \_0>
 }
 
 module.exports = trialDivision;
\ No newline at end of file