Logical Reasoning - Number Series - Discussion
Discussion Forum : Number Series - Type 2 (Q.No. 2)
Directions to Solve
Look carefully for the pattern, and then choose which pair of numbers comes next.
2.
8 11 21 15 18 21 22
Answer: Option
Explanation:
This is an alternating addition series, with a random number, 21, interpolated as every third number. The addition series alternates between adding 3 and adding 4. The number 21 appears after each number arrived at by adding 3.
Discussion:
66 comments Page 6 of 7.
Ashish minz said:
1 decade ago
@Harpreet Singh.
How he get 3..
11-8 = 3 21 is fixed.
18-15 = 3.
How he get 3..
11-8 = 3 21 is fixed.
18-15 = 3.
Hasan faraz said:
1 decade ago
Good question.
8 11 21 15 18 21 22
It is a sequence of adding 3, putting 21, adding 4 to the result of adding 3.
8 11 21 15 18 21 22
It is a sequence of adding 3, putting 21, adding 4 to the result of adding 3.
Ashok Bijoy said:
1 decade ago
8(+3) = 11, 21.
15(+3 = 18, 21.
22(+3) = 25, 21.
15(+3 = 18, 21.
22(+3) = 25, 21.
DHARMISHTHa said:
1 decade ago
(8+3)=11 & 21 is common in this series.
(15+3)=18 & 21 is common in this series.
(22+3)=25 & 21 is common in this series.
So, 8, 11, (21), 15, 18, (21), 22, 25, (21),...
(15+3)=18 & 21 is common in this series.
(22+3)=25 & 21 is common in this series.
So, 8, 11, (21), 15, 18, (21), 22, 25, (21),...
Navjot said:
1 decade ago
8,11,[21],15,18,[21],22,25,[21],29,32,[21]
1st no is 8,when 7 is added ,it gives 15 (4th number in series)
2nd no is 11 ,again when 7 is added,it gives 18(5th no in series)
21 is interpolated as every 3rd no.
4th no is 15 ,when 7 is added,it gives 22 (7th no)
5th no is 18,when 7 is added,it gives 25 (8th no)
again 21 is interpolated as 3rd no (here its 6th).
7th no is 22 ,when 7 is added,it gives 29 (10th no)
8th no is 25,when 7 is added,it gives 32 (11th no)
again 21 is interpolated as 3rd no (here its 9th).and so on.....
1st no is 8,when 7 is added ,it gives 15 (4th number in series)
2nd no is 11 ,again when 7 is added,it gives 18(5th no in series)
21 is interpolated as every 3rd no.
4th no is 15 ,when 7 is added,it gives 22 (7th no)
5th no is 18,when 7 is added,it gives 25 (8th no)
again 21 is interpolated as 3rd no (here its 6th).
7th no is 22 ,when 7 is added,it gives 29 (10th no)
8th no is 25,when 7 is added,it gives 32 (11th no)
again 21 is interpolated as 3rd no (here its 9th).and so on.....
Ganesh said:
1 decade ago
8+3 = 11
15+3 = 18
22+3 = 25
So 21 is common in this series.
15+3 = 18
22+3 = 25
So 21 is common in this series.
Zakariya said:
1 decade ago
I don't understand this type questions.
G.N.lakshmi said:
10 years ago
8+3 = 11.
15+3 = 18.
22+3 = 25.
21 is median.
15+3 = 18.
22+3 = 25.
21 is median.
K Devraju said:
9 years ago
21 is Common in this Series.
So you can See,
=> 8 + 3 = 11.
=> 15 + 3 = 18.
=> 22 + 3 = 25.
Answer comes (25 21).
So you can See,
=> 8 + 3 = 11.
=> 15 + 3 = 18.
=> 22 + 3 = 25.
Answer comes (25 21).
Kapil kapoor said:
9 years ago
@Sundar,
Thanks for the wonderful explanation.
Thanks for the wonderful explanation.
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