The number of into functions that can be defined from A= {x, y, z, w, t}  to B = $\left\{\alpha ,\beta ,\gamma \right\}$ is

$$\begin{gathered} \mathrm{A}=\left\{\mathrm{x}, \mathrm{y}, \mathrm{z}, \mathrm{w}, \mathrm{t}\right\} \Rightarrow \mathrm{n}\left(\mathrm{A}\right)=5, \\ \mathrm{B}=\left\{\mathrm{\alpha }, \mathrm{\beta }, \mathrm{\gamma }\right\} \Rightarrow \mathrm{n}\left(\mathrm{B}\right) =3. \\ \mathrm{No}. \mathrm{of} \mathrm{into} \mathrm{functions} \mathrm{from} \mathrm{A} \mathrm{to} \mathrm{B} \\ =3{\mathrm{c}}_1 \left(2^5\right)-3{\mathrm{c}}_2{\left(1\right)}^5=3\left(32\right)-3\left(1\right) \\ =96-3=93 \\ \mathrm{option} \left(4\right) \mathrm{is} \mathrm{correct} \end{gathered}$$