Logical Reasoning Number Series for PA / SA Exam 2014

1.	Look at this series: 2, 1, (1/2), (1/4), ... What number should come next?
	A. (1/3) B. (1/8) C. (2/8) D. (1/16) Answer & Explanation Answer: Option B Explanation: This is a simple division series; each number is one-half of the previous number. In other terms to say, the number is divided by 2 successively to get the next result. 4/2 = 2 2/2 = 1 1/2 = 1/2 (1/2)/2 = 1/4 (1/4)/2 = 1/8 and so on.

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2.	Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?
	A. 7 B. 10 C. 12 D. 13 Answer & Explanation Answer: Option B Explanation: This is a simple alternating addition and subtraction series. In the first pattern, 3 is added; in the second, 2 is subtracted.

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3.	Look at this series: 36, 34, 30, 28, 24, ... What number should come next?
	A. 20 B. 22 C. 23 D. 26 Answer & Explanation Answer: Option B Explanation: This is an alternating number subtraction series. First, 2 is subtracted, then 4, then 2, and so on.

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4.	Look at this series: 22, 21, 23, 22, 24, 23, ... What number should come next?
	A. 22 B. 24 C. 25 D. 26 Answer & Explanation Answer: Option C Explanation: In this simple alternating subtraction and addition series; 1 is subtracted, then 2 is added, and so on.

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5.	Look at this series: 53, 53, 40, 40, 27, 27, ... What number should come next?
	A. 12 B. 14 C. 27 D. 53 Answer & Explanation Answer: Option B Explanation: In this series, each number is repeated, then 13 is subtracted to arrive at the next number.