Question

{8,−4,2,−1,...} find the sum of the first 6 terms

Answer 1

Answer:

a=8

d=-12

n=6

S6=?

Step-by-step explanation:

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

S6=6/2(2(8)+(6-1)-12)

S6=3(16+(5)-12)

S6=3(16-60)

S6=3(-44)

S6=-132

consider positive number as 132