Question

In and arithmetic sequence, the sum of the 3rd and the 8th terms is 1. Given that the sum of the first seven terms is 35, determine the first term and the common difference.

Answer 1

Answer:

d= -3 ,

a = 98/7

Step-by-step explanation:

A3+a8=1 -(1)

a+2d+a+7d =1

2a+9d=1

sn =n/2( 2a+(n-1)d

14 a+9d=70 -(2)

solving equations 1 and 2 you will get a and d

hope it helps