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If 7times the 7th term of an AP is equal to 11 times the 11th term .find 18 th term

Posted by Geetanshi Gangwar 6 years, 10 months ago

CBSE > Class 10 > Mathematics

3 answers

Semi Garg 6 years, 10 months ago

7(a+(7-1)d)=11(a+(11-1)d) 7a+42d=11a+110d -4a=68d -a=17d We have to find 18th term So, a18=a+(18-1)d =a+17d As we got value of 17d=-a,so put in this equation =a+(-a) =a-a =0

1Thank You

Satyam Suman 6 years, 10 months ago

3Thank You

Piyush Kamboj?? 6 years, 10 months ago

3Thank You

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CBSE > Class 10 > Mathematics