[水一帖] 我绕进去了, 谁来给我解释一下1/2和1/3

${红球} = 0
${白球} = 0
${放弃} = 0

$n = 0
while($n -le 1000)
{
  $n++
  # 定义箱里的球
  $s = @("白球", "白球", "红球")
  # 打乱箱里的球
  $s_ = $s | Get-Random -Count 3 -SetSeed (Get-Random)
  # 从0,1,2中取一个数
  $i = @(0, 1, 2) | Get-Random -SetSeed (Get-Random)
  if($s_[$i] -eq "红球")
  {
    # 摸到的是红球, 放弃
    ${放弃}++
    continue
  }
  
  # 摸到的是白球, 扔掉
  # 此时箱中的球剩俩, 一个白一个红
  $s_ = @("白球", "红球")
  # 打乱剩下的俩球
  $s_ = $s_ | Get-Random -Count 2 -SetSeed (Get-Random)
  # 箱里只剩俩球, 从0,1中取一个数
  $i = @(0, 1) | Get-Random -SetSeed (Get-Random)
  if($s_[$i] -eq "白球")
  {
    ${白球}++
  }
  if($s_[$i] -eq "红球")
  {
    ${红球}++
  }
}

write-host "红球: ${红球}"
write-host "白球: ${白球}"
write-host "放弃: ${放弃}"