Observe the pattern below.
YCIND_250706_7389_expressions_36.png   YCIND_250706_7389_expressions_37.png   YCIND_250706_7389_expressions_38.png
 
1. How many squares will be there in step 9, step 47, step 68?
 
Step 9:
 
Step 47:
 
Step 68:
 
2. Write a general formula:
 
3. How would the formula change if we want to count the number of vertices of all the squares?