How to Randomly or by Sequential steps select rows from an Excel Spreadsheet

I need to either randomly select between (150-300 rows) or by step Rows 5,10,15,20.25.30,35.....etc through 1500 rows of data. This is to have a sampling of data. I thought if I make a counter column I could create some formula that would let me select either (150-300) records or just count out every few rows 5,10,15,20.25.30,35.....etc through 1500 rows of data. Then copy those records (what I do not need would either be suppressed or disappear) and put them on a new sheet. I am building a small set of tables that will be uploaded to a developer license of Salesforce. Any help is greatly appreciated. Thank you.
RM_Opportunity_Table.xlsx
Tableau Trainer & Consultant Sales Exec.Asked:
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Commented:
If you have column with counter, you can add columns for filtering:
each 5-th row
=MOD(A2-1,5)=0
random (approximately each 5-th row)
=INT(5*RAND())=3
RM_Opportunity_Table.xlsx

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Commented:
You can count filtered rows:
=SUBTOTAL(2,B:B)-2
Tableau Trainer & Consultant Sales Exec.Author Commented:
Thank you sir.
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