Here is another small script to produce random passwords consisting of a defined number of capitals, letters, numbers, and special characters:
$length = 10
$length_small = $length - 3
$numbers = '2,3,4,5,6,7,8,9' -split ','
$large = 'A,B,C,D,E,F,G,H,K,L,M,N,P,R,S,T,U,V,W,X,Y,Z' -split ','
$small = 'A,B,C,D,E,F,G,H,K,L,M,N,P,R,S,T,U,V,W,X,Y,Z'.ToLower() -split ','
$special = '!,§,$,='.Split(',')
$password = @()
$password = @($numbers | Get-Random)
$password += @($large | Get-Random)
$password += @($small | Get-Random -Count $length_small)
$password += @($special | Get-Random)
$password = $password | Get-Random -Count $length
$password -join ''
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How about native functionality?
$PasswordLength = 15$NumberOfNonAlphanumericCharacters = 3
[Reflection.Assembly]::LoadWithPartialName("System.Web") | Out-NullReturn [System.Web.Security.Membership]::GeneratePassword($PasswordLength,$NumberOfNonAlphanumericCharacters)