Make the fixture for 13 teams on the basis of knock out.

Total no. of matches:-

Total no teams -1 13-1=12 matches

Total no of round = 2*2*2*2

Digit 2 repeats four times so no of round = 4 rounds

Total no bye:- next power of 2- total no. of team 16-13 =03

$$\begin{gathered} \mathrm{Number} \mathrm{of} \mathrm{team} \mathrm{is} \mathrm{upper} \mathrm{half} \\ = \frac{\mathrm{Total} \mathrm{number} \mathrm{of} \mathrm{team} + 1}{2} =\frac{13+1}{2} \\ = 07 \mathrm{Team} \\ \mathrm{Number} \mathrm{of} \mathrm{team} \mathrm{is} \mathrm{lower} \mathrm{half} \\ = \frac{\mathrm{Total} \mathrm{number} \mathrm{of} \mathrm{team} - 1}{2} =\frac{13-1}{2} \\ = 06 \mathrm{Team} \end{gathered}$$