Latest Infosys Aptitude Question SOLUTION: 3,7,13,23,41,??

• Placement Papers
• /
• Infosys
• /
• Logical Reasoning
• /
• Number Series

Infosys Question Papers: Infosys Interview Experience(10) INFOSYS Company Profile

(#M40165210) INFOSYS Logical Reasoning question Number series Keep an EYE

3,7,13,23,41,??

Asked In Infosys suruthi (7 years ago)

Unsolved Read Solution (24)

Is this Puzzle helpful?   (67)   (23) Submit Your Solution Number Series

Read Solution (24) :

Devendra Marghade  (7 years ago)

75

First difference 4, 6, 10, 18, 34, ....
2nd difference 2, 4, 8, 16, 32, ....
So next number is 41+34=75

Is this solution Helpfull? Yes (22) | No (9)  

naveenKumar  (7 years ago)

2^1+1,2^2+3,2^3+5,2^4+7,2^5+9,2^6+11
2+1,4+3,8+5,16+7,32+9,64+11
3,7,13,23,41,75....
Ans is 75

Is this solution Helpfull? Yes (10) | No   

ANIL KUMAR YADAV  (7 years ago)

ans=75
3 to 7 difference=4
13 to 7 difference=6
23 to 13 differnece=10
41 to 23 difference=18

Is this solution Helpfull? Yes (5) | No (5)  

M.sharath kumar reddy  (7 years ago)

61
3&7 missing prime no.is 5 =1;
7&13 missing prime no.s 11=1;
13&23 m p n. 17,19 = 2;
23&41 m.p.n. 29,31,37=3;
41&61 m.p.n.43,47,53,59= 4

Is this solution Helpfull? Yes (2) | No (2)  

Prasad shetty  (7 years ago)

answer is 57

Is this solution Helpfull? Yes (2) | No (3)  

saranya kannedhari  (7 years ago)

3,7,13,23,41..??
answer is 75
difference between 7&3=4 | difference between 4&6=2
13&7=6 |difference between 10&6=4
23&13=10 |difference between 18&10=8
41&23=18 |so the next will be equal to 2*8=16
18+16=34(it is difference for last no's of the series)
so this differnece added to given last no of the series i.e., 34+41=75

Is this solution Helpfull? Yes (2) | No (1)  

Yaamini  (7 years ago)

Is this not a prime number series? I think 43 would be the next term.

Is this solution Helpfull? Yes (1) | No (8)  

Shekargoud S  (7 years ago)

3 7 13 23 41 ...
First difference 4, 6, 10, 18, 34, ....
2nd difference 2, 4, 8, 16, 32, ....
So next number is 41(present no)+34( two differences)=75

Is this solution Helpfull? Yes (1) | No   

sandeepkumar  (7 years ago)

75
first, we find the difference that is 4,6,10,18,34,...
and 2nd is 2,4,8,16,34
after that 41+34=75

Is this solution Helpfull? Yes (1) | No (1)  

Sourav Majumder  (7 years ago)

75
2 stage difference

Is this solution Helpfull? Yes (1) | No (1)  

Anand Kulkarni  (7 years ago)

3,7,13,23,41,?? 7-3=4 13-7=6, 23-13=10, 41-23=18
i.e 4,6,10,18 (Difference is increasing like 2,4,6 so next difference will be 8 )
i.e. 18+8+26 Hence Answer will be 41+26=67.

Is this solution Helpfull? Yes (1) | No (1)  

tadelu dattatreya  (6 years ago)

2*1+1=3
2*2+3=7
2*4+5=13
2*8+7=23
2*16+9=41
2*32+11=75

ans=75

Is this solution Helpfull? Yes (1) | No   

Bobbala sireesha  (7 years ago)

ans is 75,
+2 +4 +8 +16
+4 +6 +10 +18 +34
3, 7, 13, 23, 41, ??

Is this solution Helpfull? Yes | No   

  (7 years ago)

75 because 41 +34 =75

Is this solution Helpfull? Yes | No   

Mukesh Agrawal  (7 years ago)

59....The differnce is 4

Is this solution Helpfull? Yes | No (2)  

  (7 years ago)

3,7,13,23,41,..... => 7-3=4 , 13-7=6 i.e (4*2-2) , 23-13=10 i.e(6*2-2) , 41-23=18 i.e(10*2-2) Thus, difference of the two numbers is multiplied by 2 and then subtracted by 2. so 18*2-2=34. Hence, answer is 41+34=75

Is this solution Helpfull? Yes | No   

kaviya  (6 years ago)

57
16 difference there

Is this solution Helpfull? Yes | No   

KUSHAL SINGHA ROY  (6 years ago)

75.as it's happening as 2^1+1,2^2+3,2^3+5 and so on

Is this solution Helpfull? Yes | No (1)  

Ashok Reddy  (6 years ago)

3 7 13 23 41
4 6 10 18
2 4 8

next will be 16
18+16=34;
then 34+41=75

Is this solution Helpfull? Yes | No   

Naveena G  (6 years ago)

3+4=7
7+6=13
13+10=23
23+18=41
41+34=75


6-4=2^1,
10-6=4=2^2,
18-10=8=2^3,
34-18=16=2^4

Is this solution Helpfull? Yes | No   

Niranjan Mahesh  (6 years ago)

75 [(3*2)+1, (7*2)-1, (13*2)-3, (23*2)-5, (41*2)-5]

Is this solution Helpfull? Yes | No   

vino  (6 years ago)

69 ans
difference between numbers
then .....

Is this solution Helpfull? Yes | No   

Naveen  (6 years ago)

69 is answer

Is this solution Helpfull? Yes | No (1)  

V manikandan  (4 years ago)

Given:

The series: 7, 13,23,41,??

To find:

The missing term( the next number after 41)

Solution:

For finding the logic behind the series, we first check the difference between the numbers.

Here, we get to see a pattern which can be written as-

(First number*2)-1

(Second number*2)-3

(Third number*2)-5 and so on

So, each number is first multiplied by 2( constant factor) and then subtracted by a number that gets incremented by 2( 1,3,5,7,9 and so on).

So, here we get:

(7*2)-1 = 13( second number)

(13*2)-3= 23( third number)

(23*2)-5 = 41( fourth number)



So the next number( missing one) in the series would be:(41*2)-7 = 75

The missing number in the series is 75.

Is this solution Helpfull? Yes | No   

Please Login to Read Solution.