Number Series Asked in Syndicate Bank PO 2018 (25 February 2018)

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

 

Q.1 9.8 ? 10.6 7.4 13.8 1

(A) 12

(B) 6.5

(C) 3

(D) 9

(E) None of these

 

Q.2 609 204 69 24 ? 4

(A) 9

(B) 12

(C) 18

(D) 15

(E) 10

 

Q.3 500 498 489 461 ? 270

(A) 269

(B) 356

(C) 396

(D) 325

(E) 215

 

Q.4 1 3 21 71 169 ?

(A) 335

(B) 306

(C) 295

(D) 249

(E) None of these

 

Q.5 8 5 6 10 21 ?

(A) 35

(B) 53.5

(C) 29.6

(D) 45.5

(E) None of these

 

Answer 1. (D) 9

Explanation:

Pattern Series
9.8 9.8
9.8 − .8 9 (✓)
9 + 1.6 10.6
10.6 − 3.2 7.4
7.4 + 6.4 13.8
13.8 − 12.8 1

Answer 2. (A) 9

Explanation:

Pattern Series
609 609
609 ÷ 3 + 1 204
204 ÷ 3 + 1 69
69 ÷ 3 + 1 24
24 ÷ 3 + 1 9 (✓)
9 ÷ 3 + 1 4

Answer 3. (C) 396

Explanation:

Pattern Series
500 500
500 − (13 + 1) 498
498 − (23 + 1) 489
489 − (33 + 1) 461
461 − (43 + 1)  396 (✓)
396 − (53 + 1) 270

Answer 4. (E) None of these

Explanation:

Series : 1 3 21 71 169 331
Pattern : 2 18 50 98 162
+16 +32 +48 +64

Answer 5. (B) 53.5

Explanation:

Pattern Series
8 8
8 × 0.5 + 1 5
5 × 1 + 1 6
6 × 1.5 + 1 10
10 × 2 + 1 21
21 × 2.5 + 1 53.5 (✓)

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