Question

if 7 times The 7th term of AP is equal to 11 times its 11th term show that 18th term of AP is zero

Answer 1

here's the solution

Answer 2

Answer:

Answer:  = 0.

Step-by-step explanation:

▶ Given :-

→ 7 = 11

▶ To prove :-

→    = 0 .

We have,

=> 7 = 11

=> 7( a + 6d ) = 11( a + 10d ) .

=> 7a + 42d = 11a + 110d .

=> 11a - 7a = 42d - 110d .

=> 4a = - 68d .

=> 4a + 68d = 0 .

=> 4( a + 17d ) = 0 .

=> a + 17d = 0/4 .

=> a + ( 18 - 1 )d = 0.

HOPE IT HELPS!