Question

if the 3rd and 9th terms of an ap are 4 and minus -8 respectively which term is of AP is zero​

Answer 1

Answer:

a+2d=4 _1

a+8d=-8_2

using elimination

-6d=12

d=-2

a=8

according to the condition ap is 0

0=8+(n-1)(-2)

-8=-2n+2

-10=-2n

n=5

Answer 2

Answer:

Please refer the attachment dear