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
-   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
-   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
-   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
-  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
-   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