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If the 7th times the 7th term of an AP is equal to 11th times of 11th term then find its 15th term..

Posted by Suchitra Sen 3 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Supriya . 3 years, 9 months ago

7(a+6d)=11(a+10d) 7a+42d=11a+110d 0 =11a- 7a+110d-42d 0 = 4a+ 68d 0 = 4(a+17d) 0 = a+ 17 d ( as 4 goes to LSH and 0/4=0) 0 = a18 Please check question properly

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Vathsala Ranganath 3 years, 9 months ago

7(a+6d) =11(a+10d) 7a+42d = 11a+110d 0 = 11a-7a+110d-42d 0 = 4a+68d -68d=4a -68d/4=a -17d=a a 18= a+17d a 18=-17d+17d a 18 = 0 Therefore the answer is 0 and please see the question properly it's not 15th term it's 18th term

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