--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--

chipDefects() should return 0.7311720251.

assert.strictEqual(chipDefects(), 0.7311720251);

--seed--

--seed-contents--

function chipDefects() {

  return true;
}

chipDefects();

--solutions--

// solution required