CAT 1996 — QA Question 35
Arithmetic ProgressionEasy
Passage / Data
Answer the questions based on the following information.
A series S1 of five positive integers is such that the third term is half the first term and the fifth term is 20 more than the first term. In series S2, the nth term defined as the difference between the (n + 1)th term and the nth term of series S1, is an arithmetic progression with a common difference of 30.
What is the average value of the terms of series S1?
Answer & solution
- A
60
- B
70
80
- D
Average is not an integer
Solution
Consider the solution to first question of this set.
Average of S1 = (100 + 60 + 50 + 70 + 120)/5 = 80.
Hence, option (c).