Hi again to all of you guys here… May this thread fits on this section. A friend of mine gave me this enigma to do, written in excel but I can’t attach .xls file here. Enigma: There is almost an infinite amount (with 10^92 possibilities) of tables (Table1, Table 2, Table 3, Table 4, Table 5,...), with ten rows (row 0,1,2,......9) in each. Inside each table is numbers 1 to 92, 93 and 184, 185 to 276, and 277 to 284 with its position lie on their certain rows. Here I gave the example tables that have been filled in for 40 tables. By finding the patterns/ formulas, my friend asked me to extend the tables to fill in the blank tables 41,42,43,etc as given beneath of Table 40. If these tables are using permutation method, then how do you find the formula for its permutation? Thanks.