16.
In how many different ways can the letters of the word TOTAL be arranged?

17.
In how many different ways can the letters of the word SMART be arranged?

18.
$$\left( {{}^{75}{P_2} - {}^{75}{C_2}} \right) = ?$$

19.
In how many different ways can the letters of the word ABSENTEE be arranged?

20.
In how many different ways can the letters of the word OPERATE be arranged?

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