$f(A,B,C)$ = $\overline{A}\overline{C} + BC + AC + \overline{A}B$
********This method is known as variable entrant map*******
Step 1:
SOP= $\overline{A}B$
Step 2: $"\overline{C}"$
SOP = $\overline{A} = \overline{A}\overline{C}$
Step 3: "C"
SOP = B + A = BC + AC
Merge all these terms $F(A,B,C) = \overline{A}\overline{C} + AC + BC +\overline{A}B$
lemme me know if i m wrong...