Question

Sum of first and 25th terms of an arithmetic sequence is 70.
(ii) What is the 13th term of this sequence ?

Hint:

Notice that the 13th term is the middle term of the sequence from a₁ to a₂₅. The average of the first and last term in an AP segment gives the value of the middle term. So, a₁₃ = a₁ + a₂₅2 = (70)/(2) = 35.

Answer 1