Logical Reasoning - Number Series - Discussion
Discussion Forum : Number Series - Type 1 (Q.No. 6)
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
6.
Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should come next?
Answer: Option
Explanation:
In this alternating repetition series, the random number 21 is interpolated every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.
Discussion:
45 comments Page 5 of 5.
Bhargavi said:
1 decade ago
In increasing order by adding +2 then,
9+2 = 11.
11+2 = 13.
13+2 = 15.
So answer is 15.
9+2 = 11.
11+2 = 13.
13+2 = 15.
So answer is 15.
Preeti said:
1 decade ago
9 +2 = 11.
11+2 = 13.
13+2 = 15.
11+2 = 13.
13+2 = 15.
Pawan Sharma said:
1 decade ago
21-12 = 9.
21-10 = 11.
21-8 = 13.
21-6 = 15.
21-10 = 11.
21-8 = 13.
21-6 = 15.
Titus said:
1 decade ago
21-9=12
12+9=21
21-11=10
10+11=21
21-13=8
8+13=21
21-15=6
6+15=21
21-17=4
4+17=21
The numbers increase by 2 in ascending order. Therefore the answer is 15.
12+9=21
21-11=10
10+11=21
21-13=8
8+13=21
21-15=6
6+15=21
21-17=4
4+17=21
The numbers increase by 2 in ascending order. Therefore the answer is 15.
Tanweer said:
1 decade ago
21-12 = 9.
21-10 = 11.
21-8 = 13.
21-6 = 15.
21-10 = 11.
21-8 = 13.
21-6 = 15.
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