Question

How many terms of the A.R.
16, 14, 12,.... are needed to give the
sum Go & Explain why do we
get
two answers.​

Answer 1

Answer:

AP

an=a+(n-1) d

a=16

n=?

d=t2-t1

d=14-16

d=-2

an=16+(n-1) (-2)

an=16+(-2n+2)

an=18-2n

2n=18

n=18/2

n=9