IndiaBIX

Logical Reasoning - Number Series - Discussion

Discussion Forum : Number Series - Type 1 (Q.No. 2)
Number Series
Directions to Solve
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
2.
Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?
7
10
12
13
Answer: Option
Explanation:
This is a simple alternating addition and subtraction series. In the first pattern, 3 is added; in the second, 2 is subtracted.
Discussion:
105 comments Page 1 of 11.
Praveen said:   1 decade ago
Add 1 to the odd positioned (7, 8, 9, 10) numbers, and add 1 to the even positioned numbers (10, 11, 12).
Bharat said:   1 decade ago
One more thing every alternate number increase as 7, 8, 9, 10.
Rahul said:   1 decade ago
I want a solution of this one
(1)
Kasi said:   1 decade ago
I want more explanation about this with more examples example.
Harikrishnan said:   1 decade ago
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:   1 decade ago
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:   1 decade ago
Correct.
Rohit.rcert said:   1 decade ago
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.
(1)
Juhi said:   1 decade ago
Thanks Somu.K great explain. Thanks. Friend.
Gaurav said:   1 decade ago
Somu is right
Post your comments here:

Your comments will be displayed after verification.

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers