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


Answer: (d) 10

Solution: Follow the sequence given below.
image

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

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


Answer: (a) 275

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


Answer: (b) 10

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


Answer: (c) 69

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


Answer: (c) 31

Solution: Follow the sequence given below.
image

  1. 4, 16, 12, 60, ?

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


Answer: (a) 55

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


Answer: (c) 20

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


Answer: (a) 272

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


Answer: (d) 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


Answer: (c) 15

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