# Random Numbers Generator without Repeat Numbers using VBA in Microsoft Excel 2013

VBA Distinct Random Number Generator

If you want to generate random number in Excel & all the numbers should be unique (no repeat), you can use Excel Rand function to generate random numbers.

In this article, we will learn how to quickly create list of unique random numbers

We need to follow the below steps:

• Click on Developer tab
• From Code group, select Visual Basic • Enter the following code in the worksheet module

```Function DistinctRandomNumbers(NumCount As Long, LLimit As Long, ULimit As Long) As Variant
Dim RandColl As Collection, i As Long, varTemp() As Long
DistinctRandomNumbers = False
If NumCount< 1 Then Exit Function
If LLimit>ULimit Then Exit Function
If NumCount> (ULimit - LLimit + 1) Then Exit Function
Set RandColl = New Collection
Randomize
Do
On Error Resume Next
i = CLng(Rnd * (ULimit - LLimit) + LLimit)
On Error GoTo 0
Loop Until RandColl.Count = NumCount
ReDimvarTemp(1 To NumCount)
For i = 1 ToNumCount
varTemp(i) = RandColl(i)
Next i
Set RandColl = Nothing
DistinctRandomNumbers = varTemp
Erase varTemp
End Function

Sub Test()
Dim varrRandomNumberList As Variant
varrRandomNumberList = DistinctRandomNumbers(50, 1, 100)
Range(Cells(3, 1), Cells(50 + 2, 1)).Value = _
Application.Transpose(varrRandomNumberList)
End Sub

``` • After copying the code, you need to type the formula in any cell
• =DistinctRandomNumbers(50, 1, 100) In this way, we can make a list of distinct random numbers without repetition in Excel 2013.

Another way in Excel 2016

RANDBETWEEN function stands for Random number between the 2 numbers. To get the same, follow the below steps.

RANDBETWEEN function returns the random numbers between any two numbers.

Syntax:

 =RANDBETWEEN ( bottom, top )

Bottom : The smaller of the 2 numbers.

Top : The larger of the 2 numbers.

As we know a phone number have the following condition:

1. It has 10 digits
2. Cannot starts with 0

So the smallest possible number comes out to be 1000000000 and the largest possible number comes out to be 9999999999

So use the formula shown below to generate phone numbers

Use the Formula:

 = RANDBETWEEN ( 1000000000 , 9999999999 )

1000000000 : smaller one

9999999999 : larger one Just enter the formula once and repeat results using the drag down option in excel as shown in the above snapshot.

As you can see, you can get the random phone numbers in Excel.

Another ways to pick random values from given list

For this, we can opt for any of the two methods mentioned below. One method is using CHOOSE function. In this We need to input all individual values from the list to the function. You can use this formula for when number values in the list are less.

Formula using CHOOSE function:

 = CHOOSE ( RANDBETWEEN ( 1 , n) , "value1" , "value2" , "value3",,,"value n" )

n : number of values in list

value1 , value2 , value3 , till value n : individual values from the list. These values can be input either using the cell reference or using directly with quotes or using the cell reference.

Another method is using the INDEX function where we will feed a random number as index which will result in the corresponding value at the index.

Formula using INDEX function:

 =INDEX(data, RANDBETWEEN (1,ROWS (data)),col_index)

data : data array can be a list or table.

1 : start index

col_index : column index to point out the list in table.

Notes :

1. The function returns an error, if the first number argument ( bottom ) is larger than the second number argument ( top ).
2. The function returns error, if the argument to the function is non - numeric.

Hope this article about Random Numbers Generator without Repeat Numbers using VBA in Microsoft Excel is explanatory. Find more articles on generating random numbers or date values here. If you liked our blogs, share it with your fristarts on Facebook. And also you can follow us on Twitter and Facebook. We would love to hear from you, do let us know how we can improve, complement or innovate our work and make it better for you. Write us at info@exceltip.com Related Articles :

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1. Thanks for the code. Just what I needed. The screendump is naturally not correct, but the code works. Just annoyed that I didn't think of using a collection, which are knew 'all' about.

2. This code generates single random not range of distinct random number. Not useful code.

3. Well this is obviously incorrect - even the example shows 10 being repeated twice.

4. numbers are repeating itself

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