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Solved Examples(Set 1) - Series - Find Missing Number

1. Insert the missing number. $12,25,49,99,197,395,\_$
A. $789$	B. $812$
C. $1579$	D. $722$

answer with explanation

Answer: Option A

Explanation:

Each number is twice the previous one with $1$ added or subtracted alternatively.

2. Insert the missing number. $34,7,37,14,40,28,43,\_$
A. $42$	B. $56$
C. $31$	D. $46$

answer with explanation

Answer: Option B

Explanation:

We have two series here.

$34,37,40,43,\cdots \text{(increase by 3)}\\7,14,28,\cdots \text{(multiply by 2)}$

Hence, next term is $28×2=56$

3. Find the missing number. $1,4,9,16,25,36,49,\_$
A. $64$	B. $81$
C. $54$	D. $56$

answer with explanation

Answer: Option A

Explanation:

The series is $1^2,2^2,3^2,4^2,5^2,6^2,7^2,\cdots$

Hence, next term $=8^2=64$

4. Insert the missing number. $2,7,10,22,18,37,26,\_$
A. $52$	B. $42$
C. $62$	D. $46$

answer with explanation

Answer: Option A

Explanation:

There are two series here

$2,10,18,26,\cdots \text{(increase by 8)}\\7,22,37,\cdots \text{(increase by 15)}$

Hence, next term $=37+15=52$

5. Find the missing number. $4,12,48,240,1440,\_$
A. $10020$	B. $10080$
C. $7620$	D. $6200$

answer with explanation

Answer: Option B

Explanation:

$4×3=12\\12×4=48\\48×5=240\\240×6=1440\\1440×7=10080$

Set 1 Set 2 Set 3 Set 4 Set 5 Set 6

Comments(64)

Mohamed

2015-04-08 22:26:26

Missing nummber of 1, 8, 2, 7, 3, 6, 4, .......?

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Dev

2015-04-09 18:33:35

5

Two series
1 2 3 4
8 7 6 5

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Victory

2015-04-02 06:18:42

3 5 6 12 ----- 24 26

Missing number for this is 19. Please let me how the answer is 19

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gaurav

2015-10-02 14:57:10

3 6 12 24 (alternate terms getting doubled)
5 12 19 26 (increased by 7 alternate terms)

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vishal

2015-04-01 07:34:53

find next term 10,15,23,31,41,?

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md

2015-04-14 08:12:28

51

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chirag

2015-03-16 11:41:26

18,27,49,84,132..

a) 188

b) 193

c) 168

can nybody tel how the ans wil be 193 ???

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arnav

2016-08-17 06:37:39

18+9 = 27
27+22(9+13=22) = 49
49+35(22+13) =84
84+48(35+13) = 132
132+61 (48+13) =193

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saurav

2015-07-10 06:17:57

27-18=9 49-27=22 84-49=35 132-84=48 ?-132=61 ---- ?=61+132=193

22-9=13 35-22=13 48-35=13 61-48=13

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sakshi sharma

2015-06-15 12:25:19

27-18=9 49-27=22 84-49=35 132-84=48

22-91=13 35-22=13 48-35=13

so, next number will be= 132+ (48+13)= 193

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