Question

In a AP 7 times for 7th term is equal to 11th for 11th term Find 18th term

solve it and answer it​

Answer 1

Answer:

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

7a+42d=11a+110d

4a=-68d

a=-17d

Now,a18=a+17d

a18=-17d+17d=0

Step-by-step explanation:

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Answer 2

Answer:

ANSWER

WE can see that : 7×T7=11×T11

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

7a+42d=11a+110d7a−11a=110d−42d

−4a=68d∴a=−17d

Consider, T18=a+17d=−17d+17d∴T18=0

Step-by-step explanation:

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