Number of coins are 3.
The sample space will be,
[tex]S=\lbrace HHH,HHT,HTH,HTT,THH,THT,TTH,\text{TTT}\rbrace[/tex]The probablity of getting all three heads is,
[tex]\begin{gathered} P=\frac{1}{8}\times100 \\ =12.5 \end{gathered}[/tex]Thus, the requried probablity is 12.5%.
