diff --git a/src/factorial.js b/src/factorial.js
index 4f3ae70..d32704f 100644
--- a/src/factorial.js
+++ b/src/factorial.js
@@ -1,5 +1,9 @@
 const factorial = (number) => {
-  // your code here
+  if(number == 0 | number == 1) {
+    return 1
+  }else{
+    return number * (factorial(number-1))
+  }
 }
 
-module.exports = factorial;
\ No newline at end of file
+module.exports = factorial;
diff --git a/src/fibonacci.js b/src/fibonacci.js
index ea3270f..83a6ecb 100644
--- a/src/fibonacci.js
+++ b/src/fibonacci.js
@@ -1,5 +1,17 @@
+const fib = (n) => {
+  if(n<=1) {
+    return n
+  }else{
+    return parseInt(fib(n-1)) + parseInt(fib(n-2))
+  }
+}
+
 const fibonacci = (n) => {
-  // your code here
+  let res = []
+  for(let i = 1; i<=n; i++){
+    res.push(fib(i))
+  }
+  return res
 }
 
-module.exports = fibonacci;
\ No newline at end of file
+module.exports = fibonacci;
diff --git a/src/primalidad.js b/src/primalidad.js
index 8bdb849..d079105 100644
--- a/src/primalidad.js
+++ b/src/primalidad.js
@@ -1,5 +1,14 @@
 const trialDivision = (number) => {
-  // your code here
+  if(number > 1 && Number.isInteger(number)) {
+    for(let i = 2; i<number; i++) {
+      if(number % i == 0){
+        return false
+      }
+    }
+    return true
+  }else{
+    return false
+  }
 }
 
-module.exports = trialDivision;
\ No newline at end of file
+module.exports = trialDivision;