Simulate flakiness probability

simulate.js

const nrOfOptions = 10
const samples = 1000

const iterations = 100_000_000;

let seenAll = 0;
let missing = 0;

for (let i = 0; i <iterations; i++) {
  let seen = Array(nrOfOptions).fill(false)
  for (let s = 0; s < samples; s++) {
    let val = Math.floor(Math.random() * nrOfOptions)
    seen[val] = true
  }
  if (seen.every(x => x)) {
    seenAll++
  } else {
    missing++;
  }

  if (i % 1_000_000 === 0) {
    console.log({ i, seenAll, missing })
  }
}

console.log({ seenAll, missing });