Question

In an ap if 5 times the 5th term is equal to 7 times the 7th term the show the 12th term is zero​

Answer 1

Answer:

I hope this answer will helps you

Answer 2

Step-by-step explanation:

ATQ;

5(a+4d) = 7(a+6d)

5a+20d = 7a+42d

5a-7a = 42d-20d

-2a = 22d [divided by 2]

a = -11d..................(1)

we have to show that 12th term is zero,

a+11d = 0 ====> -11d+11d = 0

0 = 0

Hence LHS = RHS

Therefore, 12th is zero

thanks........