number series is given with one term missing shown by question mark (?) 1. 49, 64, 56, 57, 63, ? , 70, 43

Question

In each of the question Nos. 1 to 4 a number series is given with one term missing shown by question mark (?). This term is one of the four alternatives given under it. Find the correct alternative.

1. 49, 64, 56, 57, 63, ? , 70, 43

(1) 64 

(2) 50 

(3) 52 

(4) 166

2. 4, 13, 31, 67, ? , 283

(1) 139 

(2) 103 

(3) 121 

(4) 139

3. 1, 1, 2, 3, 5, 8, ? , 21

(1) 11 

(2) 12 

(3) 13 

(4) 14

4. 3, 24, 81, ? , 375, 648.

(1) 128 

(2) 256 

(3) 169 

(4) 192

Answer 1

Correct option: 1 - 50, 2 - 139, 3 - 13, 4 - 192

Explanation:

1. 

2. 4 × 2 + 5 = 13

13 × 2 + 5 = 31

31 × 2 + 5 = 67

67 × 2 + 5 = 139

139 × 2 + 5 = 283

3. 1 + 1 = 2

2 + 1 = 3

3 + 2 = 5

5 + 3 = 8

8 + 5 = 13

13 + 8 = 21

4. 1³ × 3 = 3

2³ × 3 = 24

3³ × 3 = 81

4³ × 3 = 192

5³ × 3 = 375

6³ × 3 = 648