freeCodeCamp/curriculum/challenges/en/08-coding-interview-prep/project-euler/problem-307-chip-defects.en.md

id, challengeType, title

id	challengeType	title
5900f4a01000cf542c50ffb2	5	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

Instructions

Tests

- text: <code>euler307()</code> should return 0.7311720251.
  testString: 'assert.strictEqual(euler307(), 0.7311720251, ''<code>euler307()</code> should return 0.7311720251.'');'

Challenge Seed

function euler307() {
  // Good luck!
  return true;
}

euler307();

Solution

// solution required