Answer 1

Let A & B denote the sets of the persons who like Hindi & English, respectively. 

\[\text{ Given }: \]
\[n\left( A \right) = 750\]
\[n\left( B \right) = 460\]
\[n\left( A \cup B \right) = 950\] 

\[ n\left( A - B \right) = n\left( A \right) - n\left( A \cap B \right)\]
\[n\left( A - B \right) = 750 - 260 = 490\]
\[\text{ Thus, 490 persons can speak only Hindi } . \]