Logical Reasoning - Number Series - Discussion
Discussion Forum : Number Series - Type 1 (Q.No. 2)
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?
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 5 of 11.
Sedhumadhavan said:
9 years ago
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.
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.
(2)
Chetan said:
8 years ago
2, 3, 7, 17, 31, 53,.....
Find the next number please.
Find the next number please.
(2)
Akash said:
5 years ago
It's 10, the logic is the addition of 3 and subtraction of 2.
(2)
Chemayek said:
4 years ago
Here, the logic is; add +3 and subtract -2 consistently.
(2)
Rahul said:
1 decade ago
I want a solution of this one
(1)
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.
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)
Rajni gangwar said:
8 years ago
18, 1, 14, 9, ?, 12, 21.
What number should place at question mark?
What number should place at question mark?
(1)
Seema roy said:
7 years ago
How will we understand which numbers to be subtracted & added?
Please explain.
Please explain.
(1)
NEBU CHERIAN said:
5 years ago
7+3=10,
10-2=8,
8+3=11,
11-2=9.
9+3=12.
12-2=10.
So, the Answer is 10.
10-2=8,
8+3=11,
11-2=9.
9+3=12.
12-2=10.
So, the Answer is 10.
(1)
Leela Borra said:
2 weeks ago
Here it is, following the sequence like even places and odd places.
At even places -- 10, 11, 12, 13, .... And at odd places -- 7, 8, 9, 10, ....
So the answer is 10.
At even places -- 10, 11, 12, 13, .... And at odd places -- 7, 8, 9, 10, ....
So the answer is 10.
(1)
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