Answer:
Pattern seen is arithmetic progression. The both equations are same.
Explanation:
a.The given pattern is 8,12,16,20,24....We can see that the difference between any two consecutive terms is 4.Therefore this is an AP(arithmetic progression).
b.Percy's equation ,

⇒

⇒

⇒

which is the same as Stella's equation . So , we can see that both equations are the same.