Series Completion Questions Tricks Shortcuts Set 3 for SBI & IBPS

Advanced 467 Reasoning Puzzles Book SBI PO 2018

Number Series Questions for Bank Exams – Now a days, almost in all competitive exams  Number Series related questions is must asked and specially in Bank Recruitment Exams.
Following are some  Number Series questions which are likely to be asked/ already asked in competitive exams. Following  Number Series questions will help you securing good marks in upcoming SBI PO, SBI Clerk, IBPS PO­ V, IBPS Clerk­ V, IBPS RRB Exams.

Questions of Series Completion Set 3

In each of the following questions, one term in the number series is wrong. Find out the wrong term.

Q1.  3, 7, 15, 39, 63, 127, 255, 511
(a) 15 
(b) 39 
(c) 63 
(d) 127

Q2.  445, 221, 109, 46, 25, 11, 4
(a) 25 
(b) 46 
(c) 109
(d) 221

Q3.  1236, 2346, 3456, 4566, 5686
(a) 1236 
(b) 3456, 
(c) 4566
(d) 5686

Q4.  5, 10, 40, 80, 320, 550, 2560
(a) 80 
(b) 320 
(c) 550
(d) 2560

Q5.  3, 2, 8, 9, 13, 22, 18, 32, 23, 42
(a) 8 
(b) 9 
(c) 13
(d) 22

Q6.  8, 27, 125, 343, 1331
(a) 8 
(b) 343 
(c) 1331
(d) None of these

Q7.  10, 14, 28, 32, 64, 68, 132
(a) 28 
(b) 32 
(c) 64
(d) 132

Q8.  1, 5, 5, 9, 7, 11, 11, 15, 12, 17
(a) 11 
(b) 12 
(c) 17
(d) 15

Q9.  11, 2, 21, 3, 32, 4, 41, 5, 51, 6
(a) 21 
(b) 11 
(c) 32
(d) 51

Q10.  11, 5, 20, 12, 40, 26, 74, 54
(a) 5 
(b) 20 
(c) 40
(d) 26

Q11.  56, 72, 90, 110, 132, 150
(a) 72 
(b) 90 
(c) 110
(d) 150

Q12.  8, 13, 21, 32, 47, 63, 83
(a) 13 
(b) 32 
(c) 47
(d) 63

Q13.  89, 78, 86, 80, 85, 82, 83
(a) 83 
(b) 82 
(c) 86
(d) 78

Q14.  25, 36, 49, 81, 121, 169, 225
(a) 36 
(b) 49 
(c) 169
(d) 225

Q15.  2, 5, 10, 17, 26, 37, 50, 64
(a) 17 
(b) 26 
(c) 37
(d) 64

Answer of Series Completion Questions 

Answer 1 : Option (b)
The correct pattern is ( × 2 + 1 )
Hence, 39 is wrong and must be replaced by (15 × 2 + 1) =  31

Answer 2 : Option (b)
Go on subtracting 3 and dividing the result by 2 to obtain the next number. So, 46 is wrong.
109 - 3 = 106 ÷ 2 = 53

Answer 3 : Option (d)
The correct pattern in the series is ( + 1110 )
So, 5686 is wrong and must be replaced by (4566 + 1110) = 5676.

Answer 4 : Option (c)
The correct pattern is × 2, × 4, × 2, × 4, .....
So, 550 is wrong and must be replaced by (320 × 2) = 640.

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

 Answer 6 : (d)
The numbers are cubes of prime numbers
Clearly, none is wrong

Answer 7 : (d)

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

Answer 8 : (b)

The given sequence is a combination of two series :
I.    1, 5, 7, 11, 12   and
II.   5, 9, 11, 15, 17
The pattern in both I and II is + 4, + 2, + 4, + 2
So, 12 is wrong and must be replaced by (11 + 2) = 13.

Answer 9 : (c)
The given sequence is a combination of two series :
I. 11,21,32,41,51 , and 
II. 2,3,4,5,6.
So the pattern is I = + 10
So, 32 is wrong and should be replaced by (21 + 10) = 31.

Answer 10 : (c)

The given sequence is a combination of two series :
I. 11, 20, 40, 74 and 
II. 5, 12, 26, 54
The pattern in I becomes + 9, + 18, + 36, So 40 is replaced by 38.


Answer 11 : (d)

The numbers are 7 × 8, 8 × 9, 9 × 10, 10 × 11,11 × 12, 12 × 13.
So, 150 is wrong and must be replaced by (12 × 13) = 156.

Answer 12 : (c)

The sequence is + 5, + 8, + 11, 
So 47 is wrong and it is replaced by (32 + 14) = 46.

Answer 13 : (c)

The sequence is - 11, + 9, - 7, + 5. - 3, + 1
So, 86 is wrong and it is replaced by (78 + 9) = 87

Answer 14 : (a) 

The correct sequence is
So, 36 is wrong.

Answer 15 : (d) 

(1×1)+1 , (2×2)+1 , (3×3)+1 , (4×4)+1 , (5×5)+1 , (6×6)+1 , (7×7)+1 So (8×8)+1 = 65
But, 64 is out of pattern.