Logical Reasoning - Number Series - Discussion
Discussion Forum : Number Series - Type 1 (Q.No. 1)
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
1.
Look at this series: 2, 1, (1/2), (1/4), ... What number should come next?
Answer: Option
Explanation:
This is a simple division series; each number is one-half of the previous number.
In other terms to say, the number is divided by 2 successively to get the next result.
4/2 = 2 2/2 = 1 1/2 = 1/2 (1/2)/2 = 1/4 (1/4)/2 = 1/8 and so on.
Discussion:
182 comments Page 2 of 19.
Naveen said:
1 decade ago
5. 2, 4, 6, 5, 7, 9, 8, ?
Just add 2 up to 3 numbers and then subtract 1 from the third number.
2+2 = 4.
4+2= 6.
6-1 = 5.
5+2 = 7.
7+2 = 9.
9-1 = 8.
8+2 = 10.
10+2 = 12.
Just add 2 up to 3 numbers and then subtract 1 from the third number.
2+2 = 4.
4+2= 6.
6-1 = 5.
5+2 = 7.
7+2 = 9.
9-1 = 8.
8+2 = 10.
10+2 = 12.
Deepa singh said:
1 decade ago
You can solve puzzle in news paper first you will confuse how can you solve but you try it again and again than you became in practice and you can solve it.
Himanshu said:
1 decade ago
Just take a half of the number series.
1, 2 ...then,
2. 1/2 means 2/2 = 1;
3. 1/2 means 1/2/2 = 0.5/2 ( we can assume 1/2 as 0.5) = 1/4 and so on...
1, 2 ...then,
2. 1/2 means 2/2 = 1;
3. 1/2 means 1/2/2 = 0.5/2 ( we can assume 1/2 as 0.5) = 1/4 and so on...
Daniel said:
10 years ago
The series is geometric progression.
a2 divide by a1 so 1/2 and a3 by a2 so 1/2/1/1.
So the comment ratio is 1/2.
2, 1, 1/2, 1/4, 1/8.
a2 divide by a1 so 1/2 and a3 by a2 so 1/2/1/1.
So the comment ratio is 1/2.
2, 1, 1/2, 1/4, 1/8.
Ibraz khan said:
7 years ago
@Shubham.
Keep taking the difference
15. 105, 315, 693, 1728, at last, you will get 48 common. By solving it we get the answer 2145.
Keep taking the difference
15. 105, 315, 693, 1728, at last, you will get 48 common. By solving it we get the answer 2145.
Appu said:
2 years ago
4/2 = 2 how come?
The series itself starts with 2, then it could be like this.
2/2 =1 ,
1/2 = 1/2 ,
1/2÷2 = 1/4 ,
1/4÷2 = 1/8.
The series itself starts with 2, then it could be like this.
2/2 =1 ,
1/2 = 1/2 ,
1/2÷2 = 1/4 ,
1/4÷2 = 1/8.
(58)
Shubham said:
9 years ago
Can anyone help me in finding the next number.
1) 4,9,10,21,22,39,34,57, ?
2) 15,105,315,693,1287, ?
3) 3,20,63,144, 275, ?
1) 4,9,10,21,22,39,34,57, ?
2) 15,105,315,693,1287, ?
3) 3,20,63,144, 275, ?
Mohan said:
6 years ago
2, 4, 6, 5, 7, 9, 8...
It is in the order of 2 times we have to add first and next number by-1 this is a alternate series.
It is in the order of 2 times we have to add first and next number by-1 this is a alternate series.
Naveen said:
10 years ago
2, 1, 1/2, 1/4, ?......2, 1, 0.5, 0.25.
See that series clearly know divided by 2, get next number.
So, 0.25/2 = 1/8.
See that series clearly know divided by 2, get next number.
So, 0.25/2 = 1/8.
Veeru said:
1 decade ago
How can we estimate that we have consider first 4?
Because by dividing first number with 2 also we will get result.
Because by dividing first number with 2 also we will get result.
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