################## PART ONE
> ("a" + "b" * 3).length
4
> ("a" + , "b" * 3).length
6

################## PART TWO
> if (2 > 1) { echo "two is larger than one" } else { echo "no it's not" }
no it's not

################## PART THREE
> if ("this string contains letter A" -contains "A") { echo "yep" } else { echo "but actually it does't" }
but actually it does't

################## PART THREE
$ cat test.ps1
function add([int] $x, [int] $y) {
    return $x + $y
}

Write-Host (add(1,2))

$ powershell ./test.ps1
add : Cannot process argument transformation on parameter 'x'. Cannot convert the "System.Object[]" value of type "System.Object[]" to type "System.Int32".
At test.ps1:5 char:16
+ Write-Host (add(1,2))
+                ~~~~~
    + CategoryInfo          : InvalidData: (:) [add], ParameterBindingArgumentTransformationException
    + FullyQualifiedErrorId : ParameterArgumentTransformationError,add