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An ordinary cubical dice having six face...

An ordinary cubical dice having six faces marked with alphabets A, B, C, D, E, and F is thrown `n` times and the list of `n` alphabets showing up are noted. Find the total number of ways in which among the alphabets A, B, C D, E and F only three of them appear in the list.

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An ordinary cubical dice having six faces marked with alphabets A,B,C,D,E, and F is thrown n xx and the list of n alphabets showing up are noted.Find the total number of ways in which among the alphabets A,B,C D,E and F only three of them appear in the list.

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