Step 1:

The o/p $Q_0$ of the least significant f/f, changes for every clock pulse, this can be achieved by wing T-type f/f with To = 1 The o/p $Q_1$ makes a transition (from 1 to 1 or 1 to 0) whenever $Q_0$ changes from 1 to 0, therefore if $Q_0$ is connected to the clock input of next T type f/f, ff1 with $T_1 = 1$ $Q_1$ will changes from $Q_0$ goes from 1 to 0 similarly, $Q_2$ makes a transition whenever $Q_1$ goes from 1 to 0, the resulting circuit shown in figure and wave form in following diagram.