Question

Given the sequence : 10, 8, 6, ..., -24. Calculate :
i) the number of terms in the sequence.(18)
ii) the sum of the sequence.(-126)​

Answer 1

Answer:

1

a=10

d=8-10=-2

an=a+(n-1)d

-24=10(n-1)*-2

-24-10=(n-1)*2

n-1=-34/2

n=17+1

n=18