Question

Q1; A pattern is made by toothpick squares. Select the series that represents the number of toothpicks added to a picture to get the next picture to the right. Pretend the first picture has no toothpicks.
Q2; Write a series in summation notation for the total number of toothpicks in a square with a side length of 6 toothpicks.

Answer 1

1) 4
2 ) 4 + 8 = 12
3) 12 + 12 = 24
4) 24 +16 = 40
5) 40 + 20 = 60
6) 60 + 24 = 84

Ao=0
An = A[n-1] + 4*n