**Please Note: **
This article is written for users of the following Microsoft Excel versions: 97, 2000, 2002, and 2003. If you are using a later version (Excel 2007 or later), *this tip may not work for you*. For a version of this tip written specifically for later versions of Excel, click here: Listing Combinations.

Ron knows he can use the COMBIN function to determine the number of combinations that can be made from a number of digits. He's wondering, however, if there is a way to list out all the combinations themselves.

There is no built-in way to list combinations in Excel. You can, however, create a macro to do the listing for you. If you want to find the unique combinations in a set of sequential numbers starting at 1, then the following set of macros will do the trick. All you need to do is run the function TestCNR and you will end up with a "matrix" of cells that represent the number of 4-digit combinations in the sequential set of values ranging from 1 to 10.

Sub TestCNR() Cnr 10, 4 End Sub

Sub Cnr(n, r) i = 1 For j = 1 To r Cells(i, j).Value = j Next Do Until Finished(n, r, i) j = FindFirstSmall(n, r, i) For k = 1 To j — 1 Cells(i + 1, k).Value = Cells(i, k).Value Next Cells(i + 1, j).Value = Cells(i, j).Value + 1 For k = j + 1 To r Cells(i + 1, k).Value = Cells(i + 1, k - 1).Value + 1 Next i = i + 1 Loop End Sub

Function Finished(n, r, i) Temp = True For j = r To 1 Step -1 If Cells(i, j).Value <> j + (n - r) Then Temp = False End If Next Finished = Temp End Function Function FindFirstSmall(n, r, i) j = r Do Until Cells(i, j).Value <> j + (n - r) j = j - 1 Loop FindFirstSmall = j End Function

The macro overwrites whatever is in your worksheet, so make sure you run the test with a blank worksheet displayed. If you want to change the size of the set or the number of elements in the subset, just change the values passed in the TestCNR routine.

If you want to pull unique combinations from a string of characters (for instance, the letters of the alphabet), then you need to use a different set of macros. The following will work fine; it assumes that the characters you want to use as your "universe" is in cell A1 and the number you want in each unique combination is in cell A2.

Sub FindSets() Dim iA() As Integer Dim sUniv As String Dim iWanted As Integer Dim j As Integer Dim k As Integer sUniv = Cells(1, 1).Value iWanted = Cells(2, 1).Value ReDim iA(iWanted) For j = 1 To iWanted iA(j) = j Next j iRow = PutRow(iA, sUniv, 1) Do Until DoneYet(iA, Len(sUniv)) j = WorkHere(iA, Len(sUniv)) iA(j) = iA(j) + 1 For k = j + 1 To iWanted iA(k) = iA(k - 1) + 1 Next k iRow = PutRow(iA, sUniv, iRow) Loop End Sub

Function DoneYet(iB, n) As Boolean iMax = UBound(iB) Temp = True For j = iMax To 1 Step -1 If iB(j) <> j + (n - iMax) Then Temp = False End If Next DoneYet = Temp End Function

Function WorkHere(iB, n) As Integer iMax = UBound(iB) j = iMax Do Until iB(j) <> j + (n - iMax) j = j - 1 Loop WorkHere = j End Function

Function PutRow(iB, sUniv, i) iMax = UBound(iB) sTemp = "" For j = 1 To iMax sTemp = sTemp & Mid(sUniv, iB(j), 1) Next j Cells(i, 2).Value = sTemp PutRow = i + 1 End Function

Run the FindSets macro and the different combinations desired end up in column 2. Be careful when running the macro, however. The number of combinations can get very large very quickly. For instance, if you put 26 letters (A through Z) in cell A1 and the value 5 in cell A2, the macro will crash. Why? Because there are 65,780 possible five-character combinations and only 65,536 rows in which to place them.

*Note:*

If you would like to know how to use the macros described on this page (or on any other page on the *ExcelTips* sites), I've prepared a special page that includes helpful information. Click here to open that special page in a new browser tab.

*ExcelTips* is your source for cost-effective Microsoft Excel training.
This tip (6766) applies to Microsoft Excel 97, 2000, 2002, and 2003. You can find a version of this tip for the ribbon interface of Excel (Excel 2007 and later) here: **Listing Combinations**.

**Save Time and Supercharge Excel!** Automate virtually any routine task and save yourself hours, days, maybe even weeks. Then, learn how to make Excel do things you thought were simply impossible! Mastering advanced Excel macros has never been easier. Check out *Excel 2010 VBA and Macros* today!

When you've got a column full of names, you may want to get a count of how many of those names are unique. You can make ...

Discover MoreFormulas are made up of operands that separate a series of terms acted upon by the operands. You may want to know, for ...

Discover MoreThere are times when it can be beneficial to combine both numbers and text in the same cell. This can be easily done ...

Discover More**FREE SERVICE:** Get tips like this every week in *ExcelTips,* a free productivity newsletter. Enter your address and click "Subscribe."

Got a version of Excel that uses the
menu interface (Excel 97, Excel 2000, Excel 2002, or Excel 2003)?
**This site is for you!** If you
use a later version of Excel, visit
our *ExcelTips* site focusing on the ribbon interface.

**FREE SERVICE:** Get tips like this every week in *ExcelTips,* a free productivity newsletter. Enter your address and click "Subscribe."

Copyright © 2020 Sharon Parq Associates, Inc.

## Comments