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REASONING - NUMBER SERIES

**1. Look at this series: F2, __, D8, C16, B32, ... What number should fill the blank?** Answer and Solution : ** E4 **The letters decrease by 1; the numbers are multiplied by 2.

**2. Look at this series: 664, 332, 340, 170, ____, 89, ... What number should fill the blank?** Answer and Solution : **178**This is an alternating division and addition series: First, divide by 2, and then add 8.**3. Look at this series: V, VIII, XI, XIV, __, XX, ... What number should fill the blank?** Answer and Solution : **XVII**This is a simple addition series; each number is 3 more than the previous number.

**4. Look at this series: 70, 71, 76, __, 81, 86, 70, 91, ... What number should fill the blank?** Answer and Solution : **70**In this series, 5 is added to the previous number; the number 70 is inserted as every third number.

**5. Look at this series: 8, 43, 11, 41, __, 39, 17, ... What number should fill in the blank?** Answer and Solution : **14**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.