# Number Series: Exercise-4

#### Overview:

 Questions and Answers Type: MCQ (Multiple Choice Questions). Main Topic: Verbal Reasoning. Verbal Reasoning Sub-topic: Number Series Questions and Answers. Number of Questions: 10 Questions with Solutions.

Directions: What should come in place of the question mark (?) in the following number series?

1. 16, 14, 14, 11, 12, 8, ?, 5

1. 6
2. 8
3. 9
4. 10

Solution: Follow the sequence given below.

1. 5, 4, 6, 15, 56, ?

1. 275
2. 245
3. 225
4. 215

Solution: Follow the sequence given below. $$5 \overset{\times 1 - 1}{\longrightarrow}\ 4 \overset{\times 2 - 2}{\longrightarrow}\ 6 \overset{\times 3 - 3}{\longrightarrow}\ \\ 15 \overset{\times 4 - 4}{\longrightarrow}\ 56 \overset{\times 5 - 5}{\longrightarrow}\ \boxed{275}$$

1. 85, 45, 25, 15, ?

1. 5
2. 10
3. 12
4. 15

Solution: Follow the sequence given below. $$85 \overset{8 \times 5 + 5}{\longrightarrow}\ 45 \overset{4 \times 5 + 5}{\longrightarrow}\ 25 \overset{2 \times 5 + 5}{\longrightarrow}\ \\ 15 \overset{1 \times 5 + 5}{\longrightarrow}\ \boxed{10}$$

1. 2, 5, 13, 31, ?

1. 49
2. 59
3. 69
4. 79

Solution: Follow the sequence given below. $$2 \overset{\times 2 + 1}{\longrightarrow}\ 5 \overset{\times 2 + 3}{\longrightarrow}\ 13 \overset{\times 2 + 5}{\longrightarrow}\ \\ 31 \overset{\times 2 + 7}{\longrightarrow}\ \boxed{69}$$

1. 3, 7, 13, 21, ?

1. 28
2. 30
3. 31
4. 32

Solution: Follow the sequence given below.

1. 4, 16, 12, 60, ?

1. 55
2. 60
3. 65
4. 70

Solution: Follow the sequence given below. $$4 \overset{\times 4}{\longrightarrow}\ 16 \overset{-4}{\longrightarrow}\ 12 \overset{\times 5}{\longrightarrow}\ \\ 60 \overset{-5}{\longrightarrow}\ \boxed{55}$$

1. 95, 55, 35, 25, ?

1. 10
2. 15
3. 20
4. 25

Solution: Follow the sequence given below. $$95 \overset{9 \times 5 + 10}{\longrightarrow}\ 55 \overset{5 \times 5 + 10}{\longrightarrow}\ 35 \overset{3 \times 5 + 10}{\longrightarrow}\ \\ 25 \overset{2 \times 5 + 10}{\longrightarrow}\ \boxed{20}$$

1. 6, 8, 20, 66, ?

1. 272
2. 256
3. 232
4. 222

Solution: Follow the sequence given below. $$6 \overset{\times 1 + (2 \times 1)}{\longrightarrow}\ 8 \overset{\times 2 + (2 \times 2)}{\longrightarrow}\ 20 \overset{\times 3 + (2 \times 3)}{\longrightarrow}\ \\ 66 \overset{\times 4 + (2 \times 4)}{\longrightarrow}\ \boxed{272}$$

1. 8, 9, 21, 68, ?

1. 226
2. 232
3. 248
4. 279

Solution: Follow the sequence given below. $$8 \overset{\times 1 + 1}{\longrightarrow}\ 9 \overset{\times 2 + 3}{\longrightarrow}\ 21 \overset{\times 3 + 5}{\longrightarrow}\ \\ 68 \overset{\times 4 + 7}{\longrightarrow}\ \boxed{279}$$

1. 74, 38, 22, 16, ?

1. 10
2. 12
3. 15
4. 16

Solution: Follow the sequence given below. $$74 \overset{\div 2 + 1}{\longrightarrow}\ 38 \overset{\div 2 + 3}{\longrightarrow}\ 22 \overset{\div 2 + 5}{\longrightarrow}\ 16 \\ \overset{\div 2 + 7}{\longrightarrow}\ \boxed{15}$$