Question

find the 13th term of an arithmetic sequence if five time the fifth term is equal to 8 times the 8th term​

Answer 1

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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