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curriculum/challenges/italian/10-coding-interview-prep/project-euler/problem-371-licence-plates.md

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+---
+id: 5900f4e01000cf542c50fff2
+title: 'Problem 371: Licence plates'
+challengeType: 5
+forumTopicId: 302033
+dashedName: problem-371-licence-plates
+---
+
+# --description--
+
+Oregon licence plates consist of three letters followed by a three digit number (each digit can be from \[0..9]).
+
+While driving to work Seth plays the following game:
+
+Whenever the numbers of two licence plates seen on his trip add to 1000 that's a win.
+
+E.g. MIC-012 and HAN-988 is a win and RYU-500 and SET-500 too. (as long as he sees them in the same trip).
+
+Find the expected number of plates he needs to see for a win. Give your answer rounded to 8 decimal places behind the decimal point.
+
+Note: We assume that each licence plate seen is equally likely to have any three digit number on it.
+
+# --hints--
+
+`euler371()` should return 40.66368097.
+
+```js
+assert.strictEqual(euler371(), 40.66368097);
+```
+
+# --seed--
+
+## --seed-contents--
+
+```js
+function euler371() {
+
+  return true;
+}
+
+euler371();
+```
+
+# --solutions--
+
+```js
+// solution required
+```