Question

9
Sum of (-13) and 7 is:
(1 Point​

Answer 1

Step-by-step explanation:

The Common Difference is 3–1 = 2

Total no of terms can be found using below formula

T1 = a+(n-1)d

Tn=a+(n−1)d

Tn is the nth Term

a is the First Ter

n is the no of Terms

d is the common difference

Here Tn is 99, d=2

99 = 1+(n-1)2;

98= 2n-2;

2n = 100;

n = 50;

There are total 50 terms in this series. Sun can be found using below formula

Sum S=n/2a+l

Where n is the no of terms

a is the first term and l is the last term

S = 50/2{1+99}

S = 25*100;

S = 2500