7 times of 7th term is equal to 11 times of 11th term then find 18th term
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7(a+6d)=11(a+10d)
7a+42d=11a+110d
4a+68d=0
4(a+17d)=0
a+17d=0.
so, 18th term (a+17d) = 0
7a+42d=11a+110d
4a+68d=0
4(a+17d)=0
a+17d=0.
so, 18th term (a+17d) = 0
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