diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-20-factorial-digit-sum.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-20-factorial-digit-sum.english.md
index 68fe997f7a..8f650ecc4e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-20-factorial-digit-sum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-20-factorial-digit-sum.english.md
@@ -61,7 +61,14 @@ sumFactorialDigits(100);
 <section id='solution'>
 
 ```js
-// solution required
+let factorial = (n) => n <= 1 ? BigInt(n) : BigInt(n) * BigInt(factorial(--n));
+
+let sumDigits = n => n.toString().split('').map(x => parseInt(x)).reduce((a,b) => a + b);
+
+function sumFactorialDigits(n) {
+  return sumDigits(factorial(n));
+}
+
 ```
 
 </section>