lottery.ps1

$candidates = @(
  'A',
  'B',
  'C',
  'D',
  'E',
  'F'
)

$winners = @()

while ($winners.Count -lt 5)
{
  $winningNumber = Get-Random -Maximum $candidates.Count
  if ($candidates[$winningNumber] -ne $null)
  {
    $winners += $candidates[$winningNumber]
    $candidates[$winningNumber] = $null
  }
}

Write-Output $winners