Which of the following is greater than $\overline 0.{72} $?

We compare each number with $0.\overline{72}$.

$0.\overline{72}=0.727272\ldots$

Now check options:

1. $0.7\overline{1}=0.711111\ldots$

$0.711111<0.727272$

2. $0.7\overline{3}=0.733333\ldots$

$0.733333>0.727272$

3. $0.\overline{70}=0.707070\ldots$

$0.707070<0.727272$

4. $0.\overline{71}=0.717171\ldots$

$0.717171<0.727272$

Correct answer: $0.7\overline{3}$