Number Series Questions for SBI Clerk, Railway Group D and IDBI Executive 2018 set-6

Direction (Q.1-5): What will come in place of the question mark (?) in the following number series?

Q.1 18, 8, 6, 8, ?, 176

(A) 36

(B) 50

(C) 24

(D) 64

(E) None of these

 

Q.2 594, ?, 374, 286, 210, 144

(A) 495

(B) 476

(C) 425

(D) 465

(E) 415

 

Q.3 212.625, 141.75, 94.5, 63, ?, 28

(A) 42

(B) 50

(C) 26

(D) 32

(E) None of these

 

Q.4 51, 53, 63, 89, 139, ?

(A) 240

(B) 275

(C) 296

(D) 265

(E) None of these

 

Q.5 22, 15, 29, 8, 36, ?

(A) 54

(B) 10

(C) 1

(D) 5

(E) 25

 

Answer 1. (C) 24

Explanation:

Pattern Series
18 18
18 × 0.50 – 1 8
8 × 1 – 2 6
6 × 2 – 4 8
8 × 4 – 8  24 (✓)
24 × 8 – 16 176

Answer 2. (B) 476

Explanation:

Series : 594 476 374 286 210 144
Pattern : -118 -102 -88 -21 -7
+16 +14 +12 +10

Answer 3. (A) 42

Explanation:

Pattern Series
212.625 212.625
212.625 ÷ 1.5 141.75
141.75 ÷ 1.5 94.5
94.5 ÷ 1.5 63
63 ÷ 1.5  42 (✓)
42 ÷ 1.5 28

Answer 4. (E) None of these

Explanation:

Pattern Series
51 51
51 + (12 + 1) 53
53 + (32 + 1) 63
63 + (52 + 1) 89
89 + (72 + 1)  139
139 + (92 + 1)  221 (✓)

Answer 5. (C) 1

Explanation:

Pattern  Series
22 22
22 – 7 15
15 + 14 29
29 – 21 8
8 + 28  36
36 – 35 1 (✓)

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