Question

the 4th term of an AP is 0.prove that the 25th term of the AP is three times its 11th term

Answer 1

a4=0

a+3d=0

Now,

a25=a+24d

=>a25=a+3d+21d

=>a25=0+21d

=>a25=21d

a11=a+10d

=>a11=a+3d+7d

=>a11=0+7d

=>a11=7d

=>3(a11)=21d

So,a25=3(a11)

Answer 2

I hope this answer will help you