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RBI GRADE ‘B’ OFFICER’S EXAM Held on: 11.10.2009 (Part-I)

📆 August 5, 2025

Total Questions: 50

41. In each of these questions a number series is given. Below the series one number is given followed by (a), (b), (c), (d) and (e). You have to complete this series following the same logic as in the original series and answer the question that follows.

5   9   25     91     414   2282.5

3  (a)  (b)   (c)   (d)       (e)

Correct Answer: (4) 64.75
Solution:The pattern of the given series is :
5 x 1.5 + 1.5 = 7.5 + 1.5 = 9
9 x 2.5 + 2.5 = 22.5 + 2.5 = 25
25 x 3.5 + 3.5 = 87.5 + 3.5 = 91
91 x 4.5 + 4.5 = 409.5 + 4.5
= 414
Similarly,
(a) 3 x 1.5 + 1.5
= 4.5 + 1.5 = 6
(b) 6 x 2.5 + 2.5
= 15 + 2.5 = 17.5
(c) 17.5 x 3.5 + 3.5
= 61.25 + 3.5 = 64.75

42. In each of these questions a number series is given. Below the series one number is given followed by (a), (b), (c), (d) and (e). You have to complete this series following the same logic as in the original series and answer the question that follows.

15      9     8   12     36    170

19    (a)   (b) (c)  (d)    (e)

What will come in place of (b) ?

Correct Answer: (2) 16
Solution:The pattern of the given series is:
15 x 1 - 1 x 6 = 15 - 6 = 9
9 x 2 - 2 x 5 = 18 - 10 = 8
8 x 3 - 3 x 4 = 24 - 12 = 12
12 x 4 - 4 x 3 = 48 - 12 = 36
36 x 5 - 5 x 2 = 180 - 10 = 170
Similarly,
(a) ⇒ 19 x 1 - 1 x 6 = 19 - 6 = 13
(b) ⇒ 13 x 2 - 2 x 5 = 26 - 10 = 16

43. In each of these questions a number series is given. Below the series one number is given followed by (a), (b), (c), (d) and (e). You have to complete this series following the same logic as in the original series and answer the question that follows.

7    6    10    27    104    515

9  (a)   (b)  (c)     (d)    (e)

What will come in place of (d) ?

Correct Answer: (1) 152
Solution:The pattern of the given se-
ries is:
7 x 1-1 = 6
6 x 2-2 = 10
10 x 3-3 = 27
27 x 4-4 = 104
104 x 5-5 = 515
Similarly,
(a) ⇒ 9 x 1-1 = 8
(b) ⇒ 8 x 2-2 = 14
(c) ⇒ 14 x 3-3 = 39
(d) ⇒ 39 x 4-4 = 152

44. In each of these questions a number series is given. Below the series one number is given followed by (a), (b), (c), (d) and (e). You have to complete this series following the same logic as in the original series and answer the question that follows.

6     16    57    244    1245    7506

4    (a)   (b)    (c)       (d)        (e)

What will come in place of (d) ?

Correct Answer: (5) None of these
Solution:The pattern of the given series is:
6 x 2 + 2² = 12 + 4 = 16
16 x 3 + 3² = 48 + 9 = 57
57 x 4 + 4² = 228 + 16 = 244
Similarly,
(a) ⇒ 4 x 2 + 2² = 8 + 4 = 12
(b) ⇒ 12 x 3 + 3² = 36 + 9 = 45
(c) ⇒ 45 x 4 + 4² = 180 + 16 = 196
(d) ⇒ 196 x 5 + 5² = 980 + 25 = 1005

45. In each of these questions a number series is given. Below the series one number is given followed by (a), (b), (c), (d) and (e). You have to complete this series following the same logic as in the original series and answer the question that follows.

8   9    20    63     256      1285

5  (a)   (b)    (c)     (d)        (e)

What will come in place of (e) ?

Correct Answer: (3) 925
Solution:The pattern of the given se-
ries is:
8 x 1 + 1 = 9
9 x 2 + 2 = 20
20 x 3 + 3 = 63
63 x 4 + 4 = 256
Similarly,
(a) ⇒ 5 x 1 + 1 = 6
(b) ⇒ 6 x 2 + 2 = 14
(c) ⇒ 14 x 3 + 3 = 45
(d) ⇒ 45 x 4 + 4 = 184
(e) ⇒ 184 x 5 + 5 = 925

46. What approximate value will come in place of the question mark (?) in the following questions ? (You are not expected to calculate exact value.)

(32.51)² – (17.45)² = ?

Correct Answer: (5) 750
Solution:? = (32.51 + 17.45) (32.51

−17.45) = 49.96 x 15.06

≈ 50 x 15 ≈ 750

47. What approximate value will come in place of the question mark (?) in the following questions ? (You are not expected to calculate exact value.)

88.25% of 450 = ?% of 530

Correct Answer: (3) 75
Solution:450 x 88 / 100 ≈ 530 x ? / 100
⇒ ? ≈ 450 x 88 / 530 ≈ 75

48. What approximate value will come in place of the question mark (?) in the following questions ? (You are not expected to calculate exact value.)

898 × (12.005)² + ? = 5000

Correct Answer: (1) 680
Solution:900 x (12)² + ? ≈ 5000
[898 ≈ 900; 12.005 ≈ 12]
⇒ 30 x 144 + ? ≈ 5000
⇒ ? ≈ 5000 - 4320 ≈ 680

49. What approximate value will come in place of the question mark (?) in the following questions ? (You are not expected to calculate exact value.)

3745 ÷ 24.05 × 17.98 = ?

Correct Answer: (2) 2800
Solution:? ≈ 3745 / 24 x 18 = 2808.75

∴ Required answer = 2800

50. What approximate value will come in place of the question mark (?) in the following questions ? (You are not expected to calculate exact value.)

117.95 × 8.017 × 4.98 = ?

Correct Answer: (4) 4720
Solution:? ≈ 118 x 8 x 5 ≈ 4720
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