Question

If 7 times the 7th term of an AP is equal to 11 times its 11th term then its 8th term is equal to ___________

Answer 1

Answer:

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Step-by-step explanation:

WE can see that : 7×T

7

=11×T

11

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

7a+42d=11a+110d

7a−11a=110d−42d

−4a=68d

∴a=−17d

Consider, T

18

=a+17d=−17d+17d∴T

18

=0