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If seven times the 7th term of AP is equal to eleven times the 11th terms,then what will be it's 18th term ?
Most Upvoted Answer
If seven times the 7th term of AP is equal to eleven times the 11th te...
7th term= a+6d
11th term= a+10d

A.T.Q.

7(a+6d)=11(a+10d)
7a+42d=11a+110d
7a-11a=110d-42d
-4a=68d
a=-68d/4
a=-17d


we have to find its 18th term,

18th term= a+17d
18th term= -17d+17d. -------(a=-17d)
18th term=0


so, the 18th term of given AP will be 0.



Thank you... :-)
Community Answer
If seven times the 7th term of AP is equal to eleven times the 11th te...
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If seven times the 7th term of AP is equal to eleven times the 11th terms,then what will be it's 18th term ?
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