Needs Help Editing a Simple Code

I am creating a code that would make all odd rows yellow and all even rows white

It's not working properly right now so I would appreciate any help editing it! The error is that the subscript is out of range

Sub loops_exercise()

Dim R As Integer
    R = 1
    Do While R < 20
   
Dim C As Integer
For C = 1 To 20

       If R Mod 2 = 0 Then
           Cells(R, C).Interior.ColorIndex = RGB(255, 0, 0)
       Else
       
           Cells(R, C).Interior.ColorIndex = RGB(2, 0, 0)
       End If
       
Next

R = R + 1
Loop
    
End Sub

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LVL 4
An Average Forum Participant Just For FunHardware Tester and DebuggerAsked:
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Bill PrewCommented:
When assigning colors to RGB() values use .Color rather than .ColorIndex as the property.


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An Average Forum Participant Just For FunHardware Tester and DebuggerAuthor Commented:
Wow... That was fast... Haha Thank you :)

@Bill Prew How about if I want to use a code involving vbYellow? Any Idea, how to edit it? :)
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NorieData ProcessorCommented:
You would replace the RGB(...) with the appropriate colour constant.
       If R Mod 2 = 0 Then
           Cells(R, C).Interior.Color = vbWhite
       Else
       
           Cells(R, C).Interior.Color = vbYellow
       End If

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John TsioumprisSoftware & Systems EngineerCommented:
Public Function Alternate()
    Dim C As Integer
    Dim R As Integer
    R = 1
    Do While R < 20
        For C = 1 To 20
            If R Mod 2 = 0 Then
                Cells(R, C).Interior.ColorIndex = 5
            Else
                Cells(R, C).Interior.ColorIndex = 50
            End If
        Next
        R = R + 1
    Loop
End Function

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ShumsDistinguished Expert - 2017Commented:
Is this Needs Help With Some Editing Of A Code doesn't solve your problem?
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An Average Forum Participant Just For FunHardware Tester and DebuggerAuthor Commented:
Hi! @Shums That other thread did solve my problem! However, I just needed help checking this one as I could't spot the mistake.. As you can see from the "Best Solution", it was a very minor mistake so forgive me as I am still a beginner hahaha :)
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