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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. $722$

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. $46$

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. $56$

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. $46$

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. $6200$

Explanation:

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

Mohamed
2015-04-08 22:26:26
Missing nummber of 1, 8, 2, 7, 3, 6, 4, .......?
Dev
2015-04-09 18:33:35
5

Two series
1    2   3    4
8    7   6    5
0 0
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
gaurav
2015-10-02 14:57:10
3 6 12 24 (alternate terms getting doubled)
5 12 19 26 (increased by 7 alternate terms)
0 0
vishal
2015-04-01 07:34:53
find next term 10,15,23,31,41,?
md
2015-04-14 08:12:28
51
0 0
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 ???
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
1 0
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
0 0
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
0 0
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