Question

if 10 times the 10th term of an AP is equal to 15 times its 15th term, show that its 25th term is zero

Answer 1

Hey

Here is your answer,

10(a+9d)=15(a+14d)
10a+90d=15a+210d
15a+210d-10a-90d=0
5a+120d=0
5(a+24d)=0
a+24d=0

therefore 25th term is zero
hence proved.

Hope it helps you!
Plz mark it as brainliest answer!

Answer 2

hope you understand my solution