Question: Each question is followed by two statements, A and B. Answer each question using the following instructions
Choose 1 if the question can be answered by using one of the statements alone but not by using the other statement alone.
Choose 2 if the question can be answered by using either of the statements alone.
Choose 3 if the question can be answered by using both statements together but not by either statement alone.
Choose 4 if the question cannot be answered on the basis of the two statements.
Is 1 a 2 + 1 a 4 + 1 a 6 + . . . > 1 a + 1 a 3 + 1 a 5 + . . . ?
A. −3 ≤ a ≤ 3
B. One of the roots of the equation 4x2 − 4x + 1 = 0 is a
R.H.S. and L.H.S. are infinite GP's with common ratio = 1 a 2 .
This statement (i) is always true for a < 1.
It does not give any conclusion regarding value of a i.e. whether it is less than 1 or not.
So, statement A alone is not sufficient to answer the question.
So, statement B alone is sufficient to answer the question.
Hence, option (a).