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 4 of 5.
Alisha said:
10 years ago
21+0 = 21, 9+2 = 11, 21+0 = 21, 11+2 = 13, 21+0 = 21, 13+2 = 15.
Answer: 15.
Answer: 15.
Kaveri said:
3 years ago
According to my logic;
21 - 12 = 9,
21 - 10 = 11,
21 - 8 = 13,
21 - 6 = 15.
21 - 12 = 9,
21 - 10 = 11,
21 - 8 = 13,
21 - 6 = 15.
(51)
Bhagyalakshmi dayal said:
7 years ago
@Akhilesh.
Thanks this is the simplest one. Thanks for the explanation.
Thanks this is the simplest one. Thanks for the explanation.
(3)
Muzaan ul aazeem said:
8 years ago
Adding and subtracting both we can use in descending or ascending.
BHUMIT DOBARIYA said:
1 decade ago
ODD POSITION : 21 21 21 21.
EVEN POSITION : 9 11 13 15 (ADD 2).
EVEN POSITION : 9 11 13 15 (ADD 2).
Jhansi said:
9 years ago
Logic : 21 becomes constant and alternate number should add 2.
Sahil suman said:
1 decade ago
It can also be done by.
9+2=11, 11+2=13, 13+2=15 answer is 15.
9+2=11, 11+2=13, 13+2=15 answer is 15.
M.RAGHURAM PGDM 1 said:
9 years ago
Take 21 alternatively and add 2 so, the answer is 15.
Swarnendu said:
9 years ago
21 remains interpolated and 2 is added to the number.
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.
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