360; I think.
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239,500,800 12!/2! * * * * * Actually, as the word "permutation" [not permutations] has 11 letters, the answer is 11!/2! = 19,958,400
If you have an alphabet of 26 letters, you can make 26 x 25 = 650 arrangements if "nt" is considered different from "tn" (order counts) or 26 x 25 / 2 = 325 arrangements if "nt" is considered the same as "tn" (order doesn't count) The permutation and combination formulas for 26 objects where 2 are chosen are 26! / (26-2)! for order counts (permutation) 26! / (26-2)!2! for order doesn't count (combination)
20
Q: How many letters of alphabet can you make using 5 squares?
you can make 6