SBI PO Prelims Exam 2017 - Day 11 (Number Series)

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Directions (1-5): What value should come in place of question mark (?) in the following number series ?

Q1. 56, 496, 3466, 17326, ?
(a) 51976
(b) 51876
(c) 52496
(d) 51986
(e) 52986

Q2. 25, 30, 66, 211.2, 887.04, ?
(a) 4602.608
(b) 4632.518
(c) 4642.548
(d) 4612.508
(e) 4612.608

Q3. 132, 156, 182, 210, ?
(a) 272
(b) 240
(c) 265
(d) 260
(e) 280

Q4. 227, 200, 173, 146, ?
(a) 121
(b) 118
(c) 119
(d) 123
(e) 117

Q5. 19   68   ?   129   145   154
(a) 154
(b) 129
(c) 145
(d) 104
(e) None of these

Directions(6-10) : In these questions, a number series is given. Only one number is wrong which does not fit in the series. Find out the wrong number.

Q6. 12, 19, 36, 93, 356
A.19
B. 36
C.93
D.356
E.None of these

Q7. 12, 14, 26, 62,143
A.12
B.14
C.26
D.62
E.143

Q8. 166, 183, 141, 181, 100, 265
A.183
B.141
C.181
D.100
E.None of these

Q9. 5, 10, 23, 73, 297
A.5
B.10
C.73
D.297
E.None of these

Q10. 10, 13, 25, 62,100
A.10
B.13
C.62
D.100
E.None of these

Directions (11-15): Find the wrong number in each of the following series.

Q11. 1, 2, 4, 12, 36, 71, 144, 432
(a) 71
(b) 36
(c) 12
(d) 2
(e) 144

Q12. 1, 3, 10, 21, 64, 129, 356, 777
(a) 1
(b) 21
(c) 356
(d) 777
(e) 64

Q13. 6072, 1008, 200, 48, 14, 5, 3
(a) 6072
(b) 3
(c) 14
(d) 1008
(e) 200

Q14. 318, 368, 345, 395, 372, 422, 400, 449
(a) 422
(b) 368
(c) 318
(d) 449
(e) 400

Q15. 54, 9, 15, 6, 24, 4, 16
(a) 9
(b) 15
(c) 6
(d) 24
(e) 16


ANSWERS :

S1. Ans.(a)
Sol.
The series is:
6 × 11 – 10 = 56
56 × 9 – 8 = 496
496 × 7 – 6 = 3466
3466 × 5 – 4 = 17326


? = 17326 × 3 – 2 = 51976

S2. Ans.(e)
Sol.
The series is:
25 × 1.2 = 30
30 × 2.2 = 66
66 × 3.2 = 211.2
211.2 × 4.2 = 887.04


? = 887.04 × 5.2 = 4612.608

S3. Ans.(b)
Sol.
The series is: (11)^2 + 11, (12)^2 + 12, (13)^2 + 13,
121 + 11 = 132
144 + 12 = 156
169 + 13 = 182
196 + 14 = 210


? = 225 + 15 = 240

S4. Ans.(c)

Sol.

The series is:

(28 × 8) + 3 = 227

(28 ×7) + 4 = 200

(28 × 6) + 5 = 173

(28 × 5) + 6 = 146

? = (28 × 4) + 7 = 119

S5. Ans.(d)

Sol.

19 + 7^2 = 68

68 + 6^2 = 104

104 + 5^2 = 129

129 + 4^2 = 145

145 + 3^2 = 154

6. Answer – B. 36
Explanation :
12* 1 + (1 * 7) = 19
19* 2 – (2 * 6) = 26
26 * 3 + (3 * 5) = 93
93 * 4 – (4 * 4) = 356
Correct Number: 26

7. Answer – E.143
Explanation :
12+12+13 = 14
14+22+23 = 26
26+32+33 = 62
62+42+43 = 142
Correct Number: 142

8. Answer – C.181
Explanation :
166+17*1 = 183
183-21*2 = 141
141 + 25*3 = 216
216-29*4 = 100
100+33*5 = 265
Correct Number: 216

9. Answer – A.5
Explanation :
8 * 1 + 2 = 10
10 * 2 + 3 = 23
23 * 3 + 4 = 73
73 * 4 + 5 = 297
Correct Number:8

10. Answer – C.62
Explanation :
10+ 3 * 1² = 13
13 + 3 * 2² = 25
25 + 3 * 3² = 52
Correct Number: 52

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