Question

Find the 13th term of an arithmetic sequence if 5 times the 5th term is equal to 8 times the 8th term

Answer 1

Answer:

Step-by-step explanation:

Let the first term be a

and common difference be d

5th term = a+4d

8th term = a+7d

Given 8(a+7d) = 5(a+4d)

8a+56d = 5a + 20d

Two variable and only one equation can be formed using given condition.

Hence this cannot be solved. One more condition is required.