If you have a lengthy column of numbers that you need to multiply by a percentage, Excel includes tools to instantly apply the product to the entire range of cells in the column.

Random Sort in Excel You can generate random numbers in Excel and use them in conjunction with Excel's sorting feature to have Excel randomize a list of data.

If you wish to count the same or duplicate values in a column only once in Excel or the count of occurances of duplicate values, read this article.