Question

The sum of5th and 9th terms of an AP is 30 if its 25 term is 3 times its 8terms find the ap

Answer 1

Answer:

Step-by-step explanation:

A5+a9=30

a+4d+a+8d=30

2a+12d=30

a+6d=15-----eq1

A25=3a8

a+24d=3(a+7d)

a+24d=3a+21d

2a=3d

a=3d/2----eq2

Substitute 2 in 1

3d/2+6d/1=15

3d+12d/2=15

15d/2=15

15d=30

d=2

2a=3×2

2a=6

a=3

Ap:3,5,7..

This will help u I think .thanku

Answer 2

For answer,please see the photo below