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

Question 1. Direction To Solve : Find out the wrong term in the given Number Series.
1236, 2346, 3456, 4566, 5686
Options:
  1.    1236
  2.    3456
  3.    4566
  4.    5686
  5.    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
Question 2. Direction To Solve : Find out the wrong term in the given Number Series.
445, 221, 109, 46, 25, 11, 4
Options:
  1.    25
  2.    46
  3.    109
  4.    221
  5.    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.
Question 3. Direction To Solve : Find out the wrong term in the given Number Series.
3, 7, 15, 39, 63, 127, 255, 511
Options:
  1.    15
  2.    39
  3.    63
  4.    127
  5.    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
Question 4. Direction To Solve : Find out the wrong term in the given Number Series.
3, 2, 8, 9, 13, 22, 18, 32, 23, 42
Options:
  1.    8
  2.    9
  3.    13
  4.    22
  5.    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
Question 5. Direction To Solve : Find out the wrong term in the given Number Series.
8, 27, 125, 343, 1331
Options:
  1.    8
  2.    343
  3.    1331
  4.    125
  5.    None of these
Answer: Option D
 -   The numbers are cubes of prime numbers i.e. 2, 3, 5, 7 hence none of the option is wrong.
Question 6. Direction To Solve : Find out the wrong term in the given Number Series.
10, 14, 28, 32, 64, 68, 132
Options:
  1.    28
  2.    32
  3.    64
  4.    132
  5.    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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