question_answer

Eight different letters of an alphabet are given. Words of four letters from these are formed. The number of such words with at least one letter repeated is

A)  \[\left( \begin{matrix}    8  \\    4  \\ \end{matrix} \right)-{{~}^{8}}{{P}_{4}}\]      

B)  \[{{8}^{4}}+\left( \begin{matrix}    8  \\    4  \\ \end{matrix} \right)\]      

C)  \[{{8}^{4}}-{}^{8}{{P}_{4}}\]        

D)  \[{{8}^{4}}-\left( \begin{matrix}    8  \\    4  \\ \end{matrix} \right)\]