Someone pls help
1) If 7 times the 7th term of an ap is equal to 11 times the 11th term. Find its 18th term
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7(a+(7-1)d)=11(a+(11-1)d)
7(a+6d)=11(a+10d)
7a+42d=11a+110d
7a-11a=110d-42d
-4a=68d
a=-17d...........(1)
now 18th term=a+17d .........(2)
putting the value of a in eqn 2
-17d+17d
that is equal to o
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