How to generate random numbers in excel without duplicates

Answer

Generating random numbers without duplicates in Excel requires careful use of formulas and functions to ensure uniqueness.

Method 1: Using RAND and RANK

1. Enter the numbers 1 through the maximum number you want in a column (e.g., A1:A100).

2. In the adjacent column (B1), enter the formula:

   =RAND()

   This generates a random decimal number between 0 and 1 for each row.

3. In a third column (C1), enter the formula to rank the random numbers:

   =RANK(B1, $B$1:$B$100)

   This will assign unique ranks to each number, effectively shuffling the original numbers.

4. The column with the ranks now represents a list of unique random numbers. Copy and paste them as values to prevent recalculation.

Method 2: Using SEQUENCE and SORTBY (Excel 365 or newer)

1. Enter the formula:

   =SORTBY(SEQUENCE(n,1,1,n),RANDARRAY(n))

   Replace n with the number of unique random numbers you want.

2. This formula generates a sequence from 1 to n and sorts it randomly using RANDARRAY.

3. The result is a column of unique random numbers without duplicates.

Method 3: Using RANDBETWEEN with Helper Column

1. In a column, enter the formula:

   =RANDBETWEEN(1,100)

   Replace 1 and 100 with your desired range.

2. Check for duplicates using conditional formatting:

   • Select the column → Home → Conditional Formatting → Highlight Cells Rules → Duplicate Values.

3. Manually remove duplicates or use the Remove Duplicates feature:

   • Select the column → Data → Remove Duplicates.

Notes

• Method 2 is the most efficient for dynamic lists in modern Excel.

• Method 1 works in all Excel versions and gives precise control over the range.

• Method 3 requires extra steps and is less automated, but can be useful for smaller ranges.

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