Logical Reasoning - Number Series - Discussion
Discussion Forum : Number Series - Type 1 (Q.No. 10)
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
10.
Look at this series: 31, 29, 24, 22, 17, ... What number should come next?
Answer: Option
Explanation:
This is a simple alternating subtraction series, which subtracts 2, then 5.
Discussion:
39 comments Page 1 of 4.
Mohit said:
7 years ago
I thought it would work as the difference of 6.
31, 29,24,22,17.
Difference between :- 31-24:-6
29-22:-6
24-17:-6
Now next number in series would be 22-15:-6, therefore, 15 would be the answer.
31, 29,24,22,17.
Difference between :- 31-24:-6
29-22:-6
24-17:-6
Now next number in series would be 22-15:-6, therefore, 15 would be the answer.
Sakshi Vaid said:
1 decade ago
Dear all,
Its a series.
31,29 (2 is subtracted).
29,24 (5 is subtracted).
24,22 (2 is subtracted).
22,17 (5 is to subtracted) .
So now from 17 (2 will be subtracted and the answer is 15).
Its a series.
31,29 (2 is subtracted).
29,24 (5 is subtracted).
24,22 (2 is subtracted).
22,17 (5 is to subtracted) .
So now from 17 (2 will be subtracted and the answer is 15).
Rizul said:
4 years ago
Difference of 2 in first two digits.
Then difference of 5 in second and third digits.
The series follows the pattern 2, 5, 2, 5, and so on.
Then difference of 5 in second and third digits.
The series follows the pattern 2, 5, 2, 5, and so on.
(2)
Premkumar said:
1 decade ago
31-29 30 is leave.
29-24 28, 27, 26, 25 is leave.
24-22 23 is leave.
22-17 21, 20, 19, 18 is leave.
So17-15 16 is leave. So answer is 15.
29-24 28, 27, 26, 25 is leave.
24-22 23 is leave.
22-17 21, 20, 19, 18 is leave.
So17-15 16 is leave. So answer is 15.
Surya said:
6 years ago
2 is the difference of first two digits.
5 is the difference second and third digit.
So the series follows 2,5, 2,5,2...
17-2 = 15.
5 is the difference second and third digit.
So the series follows 2,5, 2,5,2...
17-2 = 15.
(1)
Wozebili said:
1 decade ago
This is quiet different. If the number in sequence is 17, the next number is 3. What is the first number? Please show working.
Prasanth.E said:
8 years ago
31,29,24,22,17.
Total series=5;
29+7=22
22+7=15.
So, the difference is odd=7, second number, fourth number is considered.
Total series=5;
29+7=22
22+7=15.
So, the difference is odd=7, second number, fourth number is considered.
Shibo said:
2 years ago
I took just like this;
31 -24 = 7.
29-22 = 7.
So we had a common number 7 for the next series.
24 - 7 = 17.
22 - 7 = 15.
31 -24 = 7.
29-22 = 7.
So we had a common number 7 for the next series.
24 - 7 = 17.
22 - 7 = 15.
(4)
LUNA said:
1 year ago
So as per my analysis, the sequence of the numbers is;
31-29 = -2,
29-24 = -5,
24-22 = -2,
22-17 = -5,
17-15 = -2.
31-29 = -2,
29-24 = -5,
24-22 = -2,
22-17 = -5,
17-15 = -2.
(4)
Rupesh Kumar Yadav said:
3 years ago
Here,
31-2 = 29,
29-5 = 24,
24-2 = 22,
22-5 = 17.
So, 17 - 2 = 15 => The Answer.
31-2 = 29,
29-5 = 24,
24-2 = 22,
22-5 = 17.
So, 17 - 2 = 15 => The Answer.
(3)
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