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glish letters and 1 0 decimal digits. How many X - strings of length 1 5 satisfy all of the following properties ( at the
glish letters and decimal digits. How many Xstrings of length satisfy all of the following properties at the same time The first and last symbols of the string are distinct digits which may appear elsewhere in the string Precisely four of the symbols in the string are the letter t Precisely three characters in the string are elements of the set V a e i o u and these characters are all distinct
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