Question

Which expression defines the arithmetic series 10+ 7 +4 +... for six terms

a. (7n+3)
b.(10+3n)
c.(13-3n)

Answer 1

c.(13-3n)

if n=1, (13-3n)=13-3*1=10
if n=2, (13-3n)=13-3*2=7
if n=3, (13-3n)=13-3*3=4