Find the sum of nth term of the series 5+7+13+31 ...

2n+3

Step-by-step explanation:

formula=nd+t1-d

n is the term, t1 is term one and d is diffrence between the first two terms

2n+5-2

=2n+3

The sequence increases in increments of the sum of the term before and the increment for the term before to the current term. For example, 7+5 is 13 and 13+5 is 18 hence the next term is 13+18 is 31. The next term is thus 80. It's easier to understand if you draw out the term and the number it increases by