Direction In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much-
71.

Look at this series: J14, L16, __, P20, R22, ... What number should fill the blank?
A. S24
 B. N18
C. M18
 D. T24
Answer and Explanation
Answer: B

Explanation: In this series, the letters progress by 2, and the numbers increase by 2.




72.

Look at this series: 4, 7, 25, 10, __, 20, 16, 19, ... What number should fill the blank?
A. 13
 B. 15
C. 20
 D. 28
Answer and Explanation
Answer: A

Explanation: Two series alternate here, with every third number following a different pattern. In the main series, 3 is added to each number to arrive at the next. In the alternating series, 5 is subtracted from each number to arrive at the next.




73.

Look at this series: XXIV, XX, __, XII, VIII, ... What number should fill the blank?
A. XXII
 B. XIII
C. XVI
 D. IV
Answer and Explanation
Answer: C

Explanation: This is a simple subtraction series; each number is 4 less than the previous number.




74.

Look at this series: 0.15, 0.3, ____, 1.2, 2.4, ... What number should fill the blank?
A. 4.8
 B. 0.006
C. 0.6
 D. 0.9
Answer and Explanation
Answer: C

Explanation: This is a simple multiplication series. Each number is 2 times greater than the previous number.




75.

Look at this series: U32, V29, __, X23, Y20, ... What number should fill the blank?
A. W26
 B. W17
C. Z17
 D. Z26
Answer and Explanation
Answer: A

Explanation: In this series, the letters progress by 1; the numbers decrease by 3.