Question

The fourth term of the ap is 0 prove that the 25th term of the ap is three times its 11th term

Answer 1

Answer:

4th term is 0

a+3d=0 a=-3d[1]

25th term=3x11term

now a+24d=-3d+24d=21d (by using 1)

now 11th term will be. a+10d= -3d+10d=7d

now we can see that 25th term is 21d and 11 term is 7d

it is clear that 25th term is 3times its 11th term.

hence proved.....

HOPE THIS HELPFUL..