A rare bacterial culture is being grown in a lab. As the days progress, the cells multiply and grow. After 1 day, there is only 1 cell.
After 2 days, there are 5 cells.
After 3 days, there are 14 cells.
After 4 days, there are 30 cells.
Which recursive equation represents the pattern?
an - an - 1 +n
an = an-+ n2
an = an - 1 + 2n
an-an-1+n?