quiz_5_1_1.html

<script>
  function multiplyAll(num1, num2) {
    let result = 1;
    for (let i = num1; i <= num2; ++i)
      result *= i
    return result
  }

  console.log(multiplyAll(1, 2))
  console.log(multiplyAll(1, 3))
</script>