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curriculum/challenges/italian/10-coding-interview-prep/project-euler/problem-307-chip-defects.md

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+---
+id: 5900f4a01000cf542c50ffb2
+title: 'Problem 307: Chip Defects'
+challengeType: 5
+forumTopicId: 301961
+dashedName: problem-307-chip-defects
+---
+
+# --description--
+
+k defects are randomly distributed amongst n integrated-circuit chips produced by a factory (any number of defects may be found on a chip and each defect is independent of the other defects).
+
+Let p(k,n) represent the probability that there is a chip with at least 3 defects. For instance p(3,7) ≈ 0.0204081633.
+
+Find p(20 000, 1 000 000) and give your answer rounded to 10 decimal places in the form 0.abcdefghij
+
+# --hints--
+
+`euler307()` should return 0.7311720251.
+
+```js
+assert.strictEqual(euler307(), 0.7311720251);
+```
+
+# --seed--
+
+## --seed-contents--
+
+```js
+function euler307() {
+
+  return true;
+}
+
+euler307();
+```
+
+# --solutions--
+
+```js
+// solution required
+```