### Discussion :: Number Series - Type 1 (Q.No.2)

In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much

Praveen said: (Sep 23, 2010) | |

Add 1 to the odd positioned (7, 8, 9, 10) numbers, and add 1 to the even positioned numbers (10, 11, 12). |

Bharat said: (May 6, 2011) | |

One more thing every alternate number increase as 7, 8, 9, 10. |

Rahul said: (Jul 2, 2011) | |

I want a solution of this one |

Kasi said: (Aug 19, 2011) | |

I want more explanation about this with more examples example. |

Harikrishnan said: (Aug 24, 2011) | |

It has the alternating series as 7, 8, 9 and 10, 11, 12. So the next series will be 10, 13. Like that. |

Somu.K said: (Aug 29, 2011) | |

7+3=10 10-2=8 8+3=11 11-2=9 9+3=12 12-2=10 So, Answer is 10. This is correct or not? |

Jabin said: (Sep 22, 2011) | |

Correct. |

Rohit.Rcert said: (Sep 26, 2011) | |

It's obivously a alternate series of number in which numbers are changed by +3 and then -2 in A order. and as praveen suggest A idea of breaking this chain into two sub chain of number....1st odd place number then 2nd even place number ant then each number of series is changed by +1 is a very nice shortcut...appriciate. |

Juhi said: (Sep 28, 2011) | |

Thanks Somu.K great explain. Thanks. Friend. |

Gaurav said: (Nov 13, 2011) | |

Somu is right |

Balvir said: (Jan 4, 2012) | |

7+3=10-2=8+3=11-2=9+3=12-2=10 Ans |

Shanthi said: (Mar 8, 2012) | |

7+3=10-2=8+3=11-2=9+3=12-2=10 |

Sharanya said: (Jun 27, 2012) | |

This answer is simple. 1st add 3, next subtract 2. 7+3=10. 10-2=8. 8+3=11. 11-2=9. 9+3=12. 12-2=10. Answer 10. |

Bhushan Salunkhe said: (Sep 8, 2013) | |

7+3=10 10-2=8 8+3=11 11-2=9 9+3=12 12-2=10 Because look the series of addition and subtraction 1st add 3 you get 10 then subtraction 2 you get 8 same next again add 3 get 11. Again same - 2 get 9 again add 3 get 12 obviously next is subtraction 12-2 = 10. The series + - + - + - |

Debendra said: (Sep 26, 2013) | |

7+3=10 8+3=11 9+3=12 10+3=13 Answer 10 |

Ishwar.Kesari said: (Dec 17, 2013) | |

In first number adding three and second number subtracting two and so on you will get the missing number. |

Anusha said: (Jan 23, 2014) | |

7, 8, 9, 10... 10, 11, 12... Then we place 7, 10, 8, 11, 9, 12, 10. |

Debendra said: (Feb 19, 2014) | |

Look at this series: 7, 10, 8, 11, 9, 12, . Ans -7+3 = 10, 8+3 = 11, 9+3 = 12, 10 -- Ans (7+1,8+1, (9+1) - Ans. |

Pavan Bhushan said: (Apr 21, 2014) | |

This is an alternating series. 1st series is 7, 8, 9, 10,..... 2nd series is 10, 11, 12, 13,..... |

Zuqarnain said: (Jun 6, 2014) | |

there are actually two series, 7, 8, 9, 10... 10, 11, 12... So, we place 7, 10, 8, 11, 9, 12, 10. |

Saral Killer said: (Jul 6, 2014) | |

7, 10, 8, 11, 9, 12, ? The answer is 10 why because. Just those are compare to above series in that 7, 8, 9 and 10, 11, 12 sequence no's are display so after 7 comes 8 and after 8 comes 9 and after 9 comes 10 so answer is "10". |

Veeradevi said: (Jul 22, 2014) | |

Suggest me if the logic is wrong. Add sequence of 3,4,5... in the odd position to the 7 and add sequence of 1,2,3.... in the even position to the 7 then we get our required result. 7+3 = 10. 7+1 = 8. 7+4 = 11. 7+2 = 9. 7+5 = 12. 7+3 = 10. |

Sadichha said: (Oct 11, 2014) | |

This is a simple alternating addition & subtraction series. 7+3=10. 8+3=11. 10-2=8. 11-2=9. 9+3=12. 12-2=10. |

Katroth Ram said: (Nov 7, 2014) | |

Answer is : 10. Solution is: 7+3 = 10, 10-2 = 8, 8+3 = 11, 11-2 = 9, 9+3 = 12, 12-2 = 10 is correct or not. |

Durga said: (Nov 24, 2014) | |

How do we take first 3 only? Please answer the question because I would like to learn the reasoning ability. |

Devi said: (Dec 8, 2014) | |

Why should we take the number 3? |

Jai Kishan said: (Jan 6, 2015) | |

Can any one explain it briefly with more examples? |

Shrikant said: (Jan 17, 2015) | |

Add all the numbers and then divide it with 6. Because there are total 6 nos given, as the answer will come. E.g: 7+10+8+11+9+12=57. 57/6 = 9.5. Round figure is 10. |

Shubhi said: (Jan 23, 2015) | |

Here a simple concept is taken under use that is take first no 7. Follow logic that once you add 3 in that no so: 7+3 = 10. That whatever no you get now subtract by 2. 10-2 = 8. (continues process). So again add 3 whatever got subtract by 2 and continues series. |

Shiva Kumar Singh said: (Mar 22, 2015) | |

7 add 3 equal 10. 10 subtract 2 equal 8. 8 add 3 equal 11. 11 subtract 2 equal 9. 9 add 3 equal 12. 12 subtract 2 equal 10. So that answer is 10 right. |

Macanet said: (May 3, 2015) | |

What makes 10, the answer? |

Perin said: (Aug 2, 2015) | |

Answer should be 10. Add 1 to alternate numbers. |

Chandu said: (Aug 10, 2015) | |

Answer is 10. 7+3 = 10-2 = 8+3 = 11-2 = 9+3 = 12-2 = 10. |

Uday said: (Sep 23, 2015) | |

First find out the difference of these nos 7-10=3. 10-8=2. 8-11=3. 11-9=2. 9-12=3. Consider no 3 as no 2 as now. 7+3=10. 10-2=8. 8+3=11. 11-2=9. 9+3=12. 12-2=10. |

Tulasi said: (Sep 26, 2015) | |

Odd positions are increased by 1. And even positions are increased by 1. |

Rohan Kumbhar said: (Feb 28, 2016) | |

Very simple. First 3 is increased and second 2 is decrease. |

Santosh said: (Apr 7, 2016) | |

Answer is 10. |

Deepshikha said: (Jun 28, 2016) | |

Its simple 3 add in first-time subt. 2 in second time. 7 + 3 = 10, 10 - 2 = 8, 8 + 3 = 11, 11 - 2 = 9, Then, 12 - 2 = 10. |

Divya said: (Jul 20, 2016) | |

Thank you so much for giving a various explanation. |

Mohd Moin Ansari said: (Aug 2, 2016) | |

As per the logic, 12 - 2 = 10. |

Aditya Vamsi said: (Aug 24, 2016) | |

Just we have to use the jumbling system among the number in ascending order. |

M.Raghram Pgdm 1 said: (Aug 24, 2016) | |

The logic is, Take difference 3 and add 2 alternatively. |

John Taniang said: (Aug 25, 2016) | |

Two series 7, 8, 9 and 10, 11, 12. So 10 is the answer for the first series. |

Vinay said: (Sep 12, 2016) | |

Thank you so much for giving a solution with various explanation. |

Krishnarathod said: (Sep 21, 2016) | |

7, 8, 9, and next 10. 10, 11, 12 next is 13. So, the answer 10 is correct. |

Ayush Kumar said: (Sep 25, 2016) | |

If we see the series, we can see that alternate digits are incorrect sequence 5.7, 8, 9 then 10. 10, 11, 12. |

Simmi said: (Oct 6, 2016) | |

7 + 1 = 8, 10 + 1 = 11, 8 + 1 = 9, 11 + 1 = 12, 9 + 1 = 10. Add 1 alternatively. |

Sedhumadhavan said: (Oct 14, 2016) | |

First we find difference between each two numbers. Then that comes, 7, 10 - 2 numbers is difference. 10, 8 - (-1) number is difference. 8, 11 - 2 number is difference. 11, 9 - (-1) number is difference. 9, 12 - 2 number is difference. Next number is see before the series is 2, -1, 2, -1, 2. Then finally we consider difference is -1. So, the answer is 10. |

Navadurga said: (Oct 19, 2016) | |

Here, 7 + 3 = 10, 10 - 2 = 8, 8 + 3 = 11, 11 - 2 = 9, 9 + 3 = 12, 12 - 2 = 10 according to this B is correct answer. |

Srimathi said: (Oct 20, 2016) | |

It's a very simple. 7, 10, 8, 11, 9, 12, ... Divide in to two parts. 1st -> 7 8 9. 2nd -> 10 11 12. So the next number would be 10. |

Jagabandhu Jena said: (Dec 29, 2016) | |

Yes, 10 is right answer. |

Jada Dalei said: (Feb 1, 2017) | |

Nice solution, Thank you all. |

Kaderkhan said: (Mar 5, 2017) | |

Please solve this 11, 22, 55, 165, .... a. 495.5 b. 325.5 c. 577.5 d. 333.5 |

Chetan said: (Mar 28, 2017) | |

2, 3, 7, 17, 31, 53,..... Find the next number please. |

Ajit Singh said: (Jul 25, 2017) | |

1th line : 7.8.9. 2th line 10.11.12. Ans : 10. |

Sumeet Kumar said: (Aug 29, 2017) | |

Thanks for sharing good efforts. |

Rajni Gangwar said: (Oct 15, 2017) | |

18, 1, 14, 9, ?, 12, 21. What number should place at question mark? |

Madhavi said: (Jan 22, 2018) | |

Nice explanation. Thanks. |

Seema Roy said: (May 21, 2018) | |

How will we understand which numbers to be subtracted & added? Please explain. |

Srisai.Putta said: (Sep 4, 2018) | |

Just add & subtract the digits given in series 7, 10, 8, 11, 9, 12. Ans:7+3=10, 10-2=8, 8+3=11, 11-2=9, 9+3=12, 12-2=10 :. Next coming number in the given series is 10. |

Vineesh said: (Sep 13, 2019) | |

Nice explanation, thanks all. |

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