Number Series: Exercise-1
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.
- 8, 11, 14, 17, 20, ?
- 21
- 22
- 23
- 24
Answer: (c) 23Solution: Add +3 with every term, as given below. $$ 8 \overset{+3}{\longrightarrow}\ 11 \overset{+3}{\longrightarrow}\ 14 \overset{+3}{\longrightarrow}\ 17 \\ \overset{+3}{\longrightarrow}\ 20 \overset{+3}{\longrightarrow}\ \boxed{23} $$
- 2.5, 5, 7.5, 10, ?
- 11.5
- 12
- 12.5
- 13
Answer: (c) 12.5Solution: Add +2.5 with every term, as given below. $$ 2.5 \overset{+2.5}{\longrightarrow}\ 5 \overset{+2.5}{\longrightarrow}\ 7.5 \overset{+2.5}{\longrightarrow}\ 10 \\ \overset{+2.5}{\longrightarrow}\ \boxed{12.5} $$
- 3, 4, 7, 12, 19, ?
- 25
- 26
- 27
- 28
Answer: (d) 28Solution: Add odd numbers (1, 3, 5, 7, 9) with every term, as given below. $$ 3 \overset{+1}{\longrightarrow}\ 4 \overset{+3}{\longrightarrow}\ 7 \overset{+5}{\longrightarrow}\ 12 \\ \overset{+7}{\longrightarrow}\ 19 \overset{+9}{\longrightarrow}\ \boxed{28} $$
- 15, 13, 11, 9, 7, ?
- 5
- 4
- 3
- 2
Answer: (a) 5Solution: Subtract -2 with every term, as given below. $$ 15 \overset{-2}{\longrightarrow}\ 13 \overset{-2}{\longrightarrow}\ 11 \overset{-2}{\longrightarrow}\ 9 \\ \overset{-2}{\longrightarrow}\ 7 \overset{-2}{\longrightarrow}\ \boxed{5} $$
- 30, 22, 18, 16, ?
- 12
- 13
- 14
- 15
Answer: (d) 15Solution: Follow the sequence given below. $$ 30 \overset{-8}{\longrightarrow}\ 22 \overset{-4}{\longrightarrow}\ 18 \overset{-2}{\longrightarrow}\ 16 \\ \overset{-1}{\longrightarrow}\ \boxed{15} $$
- 3, 5, 9, 17, 33, ?
- 43
- 53
- 62
- 65
Answer: (d) 65Solution: Follow the sequence given below. $$ 3 \overset{+2}{\longrightarrow}\ 5 \overset{+4}{\longrightarrow}\ 9 \overset{+8}{\longrightarrow}\ 17 \\ \overset{+16}{\longrightarrow}\ 33 \overset{+32}{\longrightarrow}\ \boxed{65} $$
- 18, 23, 20, 25, 22, ?
- 24
- 26
- 27
- 28
Answer: (c) 27Solution: Follow the sequence given below. $$ 18 \overset{+5}{\longrightarrow}\ 23 \overset{-3}{\longrightarrow}\ 20 \overset{+5}{\longrightarrow}\ 25 \\ \overset{-3}{\longrightarrow}\ 22 \overset{+5}{\longrightarrow}\ \boxed{27} $$
- 25, 26, 28, 31, 35, ?
- 36
- 38
- 40
- 42
Answer: (c) 40Solution: Follow the sequence given below. $$ 25 \overset{+1}{\longrightarrow}\ 26 \overset{+2}{\longrightarrow}\ 28 \overset{+3}{\longrightarrow}\ 31 \\ \overset{+4}{\longrightarrow}\ 35 \overset{+5}{\longrightarrow}\ \boxed{40} $$
- 55, 45, 36, 28, 21, ?
- 18
- 17
- 16
- 15
Answer: (d) 15Solution: Follow the sequence given below. $$ 55 \overset{-10}{\longrightarrow}\ 45 \overset{-9}{\longrightarrow}\ 36 \overset{-8}{\longrightarrow}\ 28 \\ \overset{-7}{\longrightarrow}\ 21 \overset{-6}{\longrightarrow}\ \boxed{15} $$
- 2, 5, 10, ?, 26.
- 15
- 16
- 17
- 18
Answer: (c) 17Solution: Follow the sequence given below. $$ 2 \overset{+3}{\longrightarrow}\ 5 \overset{+5}{\longrightarrow}\ 10 \overset{+7}{\longrightarrow}\ \boxed{17} \overset{+9}{\longrightarrow}\ 26 $$