By LearningExpress Editors
Updated on Aug 10, 2011
Answers
 b. This is a simple alternating addition and subtraction series. The first series begins with 8 and adds 3; the second begins with 43 and subtracts 2.
 d. In this simple addition with repetition series, each number in the series repeats itself, and then increases by 12 to arrive at the next number.
 b. This is a simple subtraction series in which a random number, 93, is interpolated as every third number. In the subtraction series, 10 is subtracted from each number to arrive at the next.
 a. 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.
 d. This series alternates the addition of 4 with the subtraction of 3.
 a. In this series, 5 is added to the previous number; the number 70 is inserted as every third number.
 d. This is an alternating division and addition series: First, divide by 2, and then add 8.
 c. This is a simple multiplication series. Each number is 2 times greater than the previous number.
 b. This is a multiplication series; each number is 3 times the previous number.
 a. In this series, the letters progress by 1; the numbers decrease by 3.
 b. In this series, the letters progress by 2, and the numbers increase by 2.
 c. The letters decrease by 1; the numbers are multiplied by 2.
 d. This is a simple addition series; each number is 3 more than the previous number.
 c. This is a simple subtraction series; each number is 4 less than the previous number.
 b. This is an alternating addition and subtraction series. Roman numbers alternate with Arabic numbers. In the Roman numeral pattern, each number decreases by 1. In the Arabic numeral pattern, each number increases by 1.
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From 501 Challenging Logic & Reasoning Problems. Copyright © 2006 by LearningExpress, LLC. All Rights Reserved.
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