Question

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

Answer 1

Given= T4=0

To prove = T25=3×T11

Proof= a+3d=0

=> So a=-3d

And, a+24d=3×(a+10d)

Putting a=-3d in above equation

-3d+24d=3(-3d+10d)

=> 21d=21d

LHS=RHS

HENCE PROVED

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Answer 2

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