find the 13th term of an arithmetic sequence if five time the fifth term is equal to 8 times the 8th term
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the 13th term is 0.
the given condition is
5(a+4d)=8(a+7d)
ie.
5a+20d=8a+56d
ie.
3a+36d=0
a+12d=0
ie.
13th term is 0
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