Math-smart is something inventive in nature. You are proven to be math-smart only if you can calculate numerical logic with ease and proper justification. Numerical calculation is one of that type of subject that really challenge your mathematical abilities.

Below are** 9 questions given from number completion series**, which is a must for your upcoming job exam preparation. Stress your brain and try to find out the answer as easily as you could.

**Q1.** Which of the following number will replace the (?) mark and complete the series –

6, 24, 126, 624, ?

**Answer Option:**

a. 3126

b. 3556

c. 3443

d. 5447

### Answer

### Answer

### Explanation

### Explanation

5^2 – 1 = 24

5^3 + 1 = 126

5^4 – 1 = 624

5*5 + 1 = 3126

So, ‘?’ will be replaced with 3126

**Q2.** Which of the following number will replace the (?) mark and complete the series –

4, 16, 256, 65536, ?

**Answer Option:**

a. 4294967296

b. 4294947296

c. 9642949472

d. 7672949496

### Answer

### Answer

### Explanation

### Explanation

So, ‘?’ will be replaced with 4294967296.

**Q3.** Which of the following number will replace the (?) mark and complete the series –

9, 14, 24, 39, 59, ?

**Answer Option:**

a. 64

b. 74

c. 84

d. 94

### Answer

### Answer

### Explanation

### Explanation

**Q4.** Which of the following number will replace the (?) mark and complete the series –

6, 14, 22, 34, 46, 62, 78, ?

**Answer Option:**

a. 80

b. 90

c. 98

d. 108

### Answer

### Answer

### Explanation

### Explanation

**Q5.** Which of the following number will replace the (?) mark and complete the series –

0, 6, 24, 60, 120, ?

**Answer Option:**

a. 130

b. 180

c. 210

d. None of the above

### Answer

### Answer

### Explanation

### Explanation

(2x2x2) – 2 = 6

(3x3x3) – 3 = 24

(4x4x4) – 4 = 60

(5x5x5) – 5 = 120

(6x6x6) – 6 = 210

**All the above tricks are solved below in the VIDEO:**

**Q6.** Which of the following number will replace the (?) mark and complete the series –

40, 33, 47, 40, 54, 47, 61, ?

**Answer Option:**

a. 50

b. 54

c. 60

d. 74

### Answer

### Answer

### Explanation

### Explanation

**Q7.** Which of the following number will replace the (?) mark and complete the series –

4, 7, 7, 12, 10, 17, 13, 22, 16, ?

**Answer Option:**

a. 19

b. 23

c. 27

d. 40

### Answer

### Answer

### Explanation

### Explanation

**Q8.** Which of the following number in the series is wrong?

8, 4, 4, 6, 12, 28, 90

**Answer Option:**

a. 4

b. 6

c. 12

d. 28

### Answer

### Answer

### Explanation

### Explanation

8 x 1/2

4 x 1

4 x 3/2

6 x 2,

12 x 5/2,

30 x 3……………..and so on.

So, 30 will be replaced with 28.

**Q9.** Which of the following number in the series is wrong?

2, 7, 28, 146, 877, 6140

**Answer Option:**

a. 7

b. 28

c. 146

d. 332

### Answer

### Answer

### Explanation

### Explanation

2 x 3 + 1

7 x 4 + 1

28 x 5 + 1……so 28 is wrong.

**Q6 to Q9 are demonstrated in the following VIDEO:**