Question

If 7 times the 7th term of an AP is equal to 11 times its 11th term, then 18th term is:

Answer 1

Answer:

7(a+6d)=11,(a+10d)

7a+42d=11a+110d

-4a=68d

a=-17d. eqn1

18 term is a+17d

by eqn 1

a+17d=0

then 18term is 0

Answer 2

Answer:

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