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Math problem, high score problem, ask how many groups of 26 English letters are arranged, 10 Arabic math. (It must consist of two English letters plus eight Arabic numerals.
Choose two letters at will, including c (26,2) = 26× 25/2 = 325.
Take any number of 8, including c c( 10/0,8) =10× 9/2 = 45.
The complete arrangement of 10 characters (2 letters +8 numbers) is as follows: