Dear readers,
In Banking and Insurance examinations, in Quantitative Aptitude, questions from Number series are frequently asked. Such questions test a candidate’s decision-making ability and speed using limited input.
The quiz on Number series provided here, will help you prepare for the upcoming exams. Please try to give answers in the comment box; soon we will publish the correct answers.
Directions
(1-5): In the
following number series, a wrong
number is given. Find out the wrong number.
1. 29,
37, 21, 43, 13, 53, 5
(1) 37
(2) 53
(3) 13
(4) 21
(5) 43
2. 600,
125, 30, 13, 7.2, 6.44, 6.288
(1) 125
(2) 30
(3) 13
(4) 6.44
(5) 7.2
3. 80,
42, 24, 13.5, 8.75, 6.375, 5.1875
(1) 8.75
(2) 13.5
(3) 24
(4) 6.375
(5) 42
4. 10,
8, 13, 35, 135, 671, 4007
(1) 8
(2) 671
(3) 135
(4) 13
(5) 35
5. 150,
290, 560, 1120, 2140, 4230, 8400
(1) 2140
(2) 4230
(3) 560
(4) 290
(5) 1120
Answers:
Qs 1 (5)
Qs 2 (3) Qs 3 (3) Qs 4 (2)
Qs 5 (5)
Solutions:
1.
29,
37, 21, 43, 13, 53, 5
29 – 8 = 21,
21 – 8 = 13,
13 – 8 = 5
37 +8 = 45
45 + 8 = 53
So wrong number in the series is 43
2.
600,
125, 30, 13, 7.2, 6.44, 6.288
6.288 x 5 – (5×5) = 6.44
6.44 x 5 – (5×5) = 7.2
7.2 x 5 – (5×5) = 11
11 x 5 – (5×5) = 30
30 x 5 – (5×5) = 125
125 x 5 – (5×5) = 600
So wrong number in the series is 13
3.
80,
42, 24, 13.5, 8.75, 6.375, 5.1875
5.1875 x 2 – (2×2) = 6.375
6.375 x 2 – (2×2) = 8.75
8.75 x 2 – (2×2) = 13.5
13.5 x 2 – (2×2) = 23
24 x 2 – (2×2) = 42
42 x2 – (2×2) = 80
So wrong number in the series is 24.
4.
10,
8, 13, 15, 35, 135, 671, 4007
10 x1 – 2 = 8
8 x2 – 3 = 13
13 x3 – 4 = 35
35 x4 – 5 = 135
135 x 5 – 6 = 669
669 x 6 – 7 = 4007
So wrong number in the series is 671
5.
150,
290, 560, 1120, 2140, 4230, 8400
150 x2 – 10 = 290
290 x 2 – 20 = 560
560 x 2 – 30 = 1090
1090 x2 – 40 = 2140
So wrong number in the series is 1120.