Randbetween

[aaronbeckman]

I need help with the formula for assigning 20 randomized numbers (1-20) that can not repeat. Please help. Thank you!

 

[shg]

In A1:A20, list the numbers 1 to 20

In another column (say B1:B20), enter =rand()

Sort both columns by column B.

 

[Eric W]

Excel 2010

	A
List

<colgroup><col style="width: 25pxpx"><col></colgroup><thead>
</thead><tbody>
[TD="align: center"]1[/TD]

[TD="align: center"]2[/TD]
[TD="align: right"]1[/TD]

[TD="align: center"]3[/TD]
[TD="align: right"]4[/TD]

[TD="align: center"]4[/TD]
[TD="align: right"]6[/TD]

[TD="align: center"]5[/TD]
[TD="align: right"]12[/TD]

[TD="align: center"]6[/TD]
[TD="align: right"]10[/TD]

[TD="align: center"]7[/TD]
[TD="align: right"]20[/TD]

[TD="align: center"]8[/TD]
[TD="align: right"]14[/TD]

[TD="align: center"]9[/TD]
[TD="align: right"]9[/TD]

[TD="align: center"]10[/TD]
[TD="align: right"]17[/TD]

[TD="align: center"]11[/TD]
[TD="align: right"]15[/TD]

[TD="align: center"]12[/TD]
[TD="align: right"]16[/TD]

[TD="align: center"]13[/TD]
[TD="align: right"]3[/TD]

[TD="align: center"]14[/TD]
[TD="align: right"]7[/TD]

[TD="align: center"]15[/TD]
[TD="align: right"]19[/TD]

[TD="align: center"]16[/TD]
[TD="align: right"]2[/TD]

[TD="align: center"]17[/TD]
[TD="align: right"]5[/TD]

[TD="align: center"]18[/TD]
[TD="align: right"]11[/TD]

[TD="align: center"]19[/TD]
[TD="align: right"]13[/TD]

[TD="align: center"]20[/TD]
[TD="align: right"]8[/TD]

[TD="align: center"]21[/TD]
[TD="align: right"]18[/TD]

</tbody>

Sheet12​

[TABLE="width: 85%"]
<tbody>[TR]
[TD]Array Formulas[TABLE="width: 100%"]
<thead>[TR="bgcolor: #DAE7F5"]
[TH="width: 10px"]Cell[/TH]
[TH="align: left"]Formula[/TH]
[/TR]
</thead><tbody>[TR]
[TH="width: 10px, bgcolor: #DAE7F5"]A2[/TH]
[TD="align: left"]{=LARGE(ROW($1:$20)*NOT(COUNTIF($A$1:A1, ROW($1:$20))), RANDBETWEEN(1,21-ROW(A1)))}[/TD]
[/TR]
</tbody>[/TABLE]
Entered with Ctrl+Shift+Enter. If entered correctly, Excel will surround with curly braces {}.
Note: Do not try and enter the {} manually yourself[/TD]
[/TR]
</tbody>[/TABLE]



Then copy the formula in A2 and paste it through A21. You can generate a new list just by recalculating the sheet (F9).