**Direction To Solve : Find out the wrong term in the given Number Series.**

__Question:__5, 10, 40, 80, 320, 550, 2560

**Options:**

A. | 80 | |

B. | 320 | |

C. | 550 | |

D. | 2560 | |

E. | None of these |

**Answer: Option C**

- The sequence is x2, x4, x2, x4, ….. so 550 is wrong and must be replaced by (320 x 2) = 640.

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## More Questions Related to Reasoning Ability > Series > Number Series :

**Direction To Solve : Find out the wrong term in the given Number Series.**

__Question 1.__1236, 2346, 3456, 4566, 5686

**Options:**

- 1236
- 3456
- 4566
- 5686
- None of these

**Answer: Option D**

- The first digits of the numbers form the series 1, 2, 3, 4, 5; the second digits form the series 2, 3, 4, 5, 6; the third digits form the series 3, 4, 5, 6,; while the last digits in each of the numbers is 6. So 5686 is wrong and replaced by 5676

**Direction To Solve : Find out the wrong term in the given Number Series.**

__Question 2.__445, 221, 109, 46, 25, 11, 4

**Options:**

- 25
- 46
- 109
- 221
- None of these

**Answer: Option B**

- 3 is subtracted from each number and result is divided by 2 to obtained the next number, so 46 is wrong and must be replaced by 53.

**Direction To Solve : Find out the wrong term in the given Number Series.**

__Question 3.__3, 7, 15, 39, 63, 127, 255, 511

**Options:**

- 15
- 39
- 63
- 127
- None of these

**Answer: Option B**

- Each number in the series is multiplied by 2 and result increased by 1 to obtain the next number so 39 is wrong and replaced by (15 x 2 + 1) = 31

**Direction To Solve : Find out the wrong term in the given Number Series.**

__Question 4.__3, 2, 8, 9, 13, 22, 18, 32, 23, 42

**Options:**

- 8
- 9
- 13
- 22
- None of these

**Answer: Option B**

- The given sequence is a combination of two series (1) 3, 8, 13, 18, 23 and (2) 2, 9, 22, 32, 42. The pattern in first series is +5 and in the second series is +10 So 9 is wrong and must be replaced by (2 + 10) = 12

**Direction To Solve : Find out the wrong term in the given Number Series.**

__Question 6.__10, 14, 28, 32, 64, 68, 132

**Options:**

- 28
- 32
- 64
- 132
- None of these

**Answer: Option D**

- Alternately, the numbers are increased by four and doubled to get the next number Thus (10 + 4 =14, 14 x 2 = 28), (28 + 4 = 32, 32 x 2 = 64) and so on. So 132 is wrong and must be replaced by (68 x 2) = 136

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