Two Series

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(CAT 1996)

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) term and the nth term of series S1, is an arithmetic progression with a common difference of 30.

1. First term of S1 is
a. 80 
b. 90 
c. 100 
d. 120

2. Second term of S2 is
a. 50 
b. 60 
c. 70 
d. None of these

3. What is the difference between second and fourth terms of S1?
a. 10 
b. 20 
c. 30 
d. 60

4. What is the average value of the terms of series S1?
a. 60 
b. 70
c. 80 
d. Average is not an integer

5. What is the sum of series S2?
a. 10 
b. 20 
c. 30 
d. 40

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