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curriculum/challenges/italian/10-coding-interview-prep/project-euler/problem-213-flea-circus.md

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+---
+id: 5900f4411000cf542c50ff54
+title: 'Problem 213: Flea Circus'
+challengeType: 5
+forumTopicId: 301855
+dashedName: problem-213-flea-circus
+---
+
+# --description--
+
+A 30×30 grid of squares contains 900 fleas, initially one flea per square.
+
+When a bell is rung, each flea jumps to an adjacent square at random (usually 4 possibilities, except for fleas on the edge of the grid or at the corners).
+
+What is the expected number of unoccupied squares after 50 rings of the bell? Give your answer rounded to six decimal places.
+
+# --hints--
+
+`euler213()` should return 330.721154.
+
+```js
+assert.strictEqual(euler213(), 330.721154);
+```
+
+# --seed--
+
+## --seed-contents--
+
+```js
+function euler213() {
+
+  return true;
+}
+
+euler213();
+```
+
+# --solutions--
+
+```js
+// solution required
+```