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 3, step 48, step 62?
 
Step 3:
 
Step 48:
 
Step 62:
 
2. Write a general formula:
 
3. How would the formula change if we want to count the number of vertices of all the squares?