In the final answer of the expression $$\frac{{\left( {29.2 - 20.2} \right)\left( {1.79 \times {{10}^5}} \right)}}{{1.37}}$$      the number of significant figures is

Solution :
On calculation we find
$$\eqalign{ & \frac{{\left( {29.2 - 20.2} \right)\left( {1.79 \times {{10}^5}} \right)}}{{1.37}} \cr & = 1.17 \times {10^6} \cr} $$
As the least precise number contains 3 significant figures, therefore answer should also contains 3 significant figures.