Number Series: Exercise-3

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. 3, 2, 3, 8, ?

    1. 21
    2. 28
    3. 30
    4. 31


Answer: (d) 31

Solution: Follow the sequence given below. $$ 3 \overset{\times 1 -1}{\longrightarrow}\ 2 \overset{\times 2 -1}{\longrightarrow}\ 3 \overset{\times 3 -1}{\longrightarrow}\ 8 \overset{\times 4 -1}{\longrightarrow}\ \boxed{31} $$

  1. 2, 6, 14, 30, ?

    1. 120
    2. 122
    3. 126
    4. 128


Answer: (c) 126

Solution: Follow the sequence given below. $$ 2 \overset{\times 2 +2}{\longrightarrow}\ 6 \overset{\times 2 +2}{\longrightarrow}\ 14 \overset{\times 2 +2}{\longrightarrow}\ \\ 30 \overset{\times 2 +2}{\longrightarrow}\ 62 \overset{\times 2 +2}{\longrightarrow}\ \boxed{126} $$

  1. 36, 34, 30, 28, 24, ?

    1. 22
    2. 28
    3. 32
    4. 33


Answer: (a) 22

Solution: Follow the sequence given below. $$ 36 \overset{-2}{\longrightarrow}\ 34 \overset{-4}{\longrightarrow}\ 30 \overset{-2}{\longrightarrow}\ \\ 28 \overset{-4}{\longrightarrow}\ 24 \overset{-2}{\longrightarrow}\ \boxed{22} $$

  1. 5, 5, 10, 30, 120, ?

    1. 300
    2. 320
    3. 560
    4. 600


Answer: (d) 600

Solution: Follow the sequence given below. $$ 5 \overset{\times 1}{\longrightarrow}\ 5 \overset{\times 2}{\longrightarrow}\ 10 \overset{\times 3}{\longrightarrow}\ \\ 30 \overset{\times 4}{\longrightarrow}\ 120 \overset{\times 5}{\longrightarrow}\ \boxed{600} $$

  1. 4, 8, 16, 32, 64, ?

    1. 86
    2. 112
    3. 122
    4. 128


Answer: (d) 128

Solution: Follow the sequence given below. $$ 4 \overset{\times 2}{\longrightarrow}\ 8 \overset{\times 2}{\longrightarrow}\ 16 \overset{\times 2}{\longrightarrow}\ \\ 32 \overset{\times 2}{\longrightarrow}\ 64 \overset{\times 2}{\longrightarrow}\ \boxed{128} $$

  1. 4, 6, 15, 49, ?

    1. 136
    2. 168
    3. 201
    4. 224


Answer: (c) 201

Solution: Follow the sequence given below. $$ 4 \overset{\times 1 +2}{\longrightarrow}\ 6 \overset{\times 2 +3}{\longrightarrow}\ 15 \overset{\times 3 +4}{\longrightarrow}\ 49 \overset{\times 4 +5}{\longrightarrow}\ \boxed{201} $$

  1. 7, 12, 19, 28, ?

    1. 32
    2. 38
    3. 39
    4. 47


Answer: (c) 39

Solution: Follow the sequence given below. $$ 7 \overset{+5}{\longrightarrow}\ 12 \overset{+7}{\longrightarrow}\ 19 \overset{+9}{\longrightarrow}\ 28 \overset{+11}{\longrightarrow}\ \boxed{39} $$

  1. 36, 20, 12, 8, ?

    1. 7
    2. 6
    3. 5
    4. 4


Answer: (b) 6

Solution: Follow the sequence given below. $$ 36 \overset{\times 0.5 +2}{\longrightarrow}\ 20 \overset{\times 0.5 +2}{\longrightarrow}\ 12 \overset{\times 0.5 +2}{\longrightarrow}\ 8 \overset{\times 0.5 +2}{\longrightarrow}\ \boxed{6} $$

  1. 1, 3, 8, 26, ?

    1. 102
    2. 106
    3. 110
    4. 112


Answer: (b) 106

Solution: Follow the sequence given below. $$ 1 \overset{\times 1 +2}{\longrightarrow}\ 3 \overset{\times 2 +2}{\longrightarrow}\ 8 \overset{\times 3 +2}{\longrightarrow}\ 26 \overset{\times 4 +2}{\longrightarrow}\ \boxed{106} $$

  1. 113, 225, 449, ?, 1793.

    1. 865
    2. 887
    3. 892
    4. 897


Answer: (d) 897

Solution: Follow the sequence given below. $$ 113 \overset{\times 2 -1}{\longrightarrow}\ 225 \overset{\times 2 -1}{\longrightarrow}\ 449 \overset{\times 2 -1}{\longrightarrow}\ \boxed{897} \\ \overset{\times 2 -1}{\longrightarrow}\ 1793 $$