Logical Reasoning - Number Series - Discussion
Discussion Forum : Number Series - Type 2 (Q.No. 1)
Directions to Solve
Look carefully for the pattern, and then choose which pair of numbers comes next.
1.
28 25 5 21 18 5 14
Answer: Option
Explanation:
This is an alternating subtraction series with the interpolation of a random number, 5, as every third number. In the subtraction series, 3 is subtracted, then 4, then 3, and so on.
Discussion:
128 comments Page 10 of 13.
Ram babu said:
1 decade ago
Divide the given series into 3 sets of 3 no. each then find the diff of 1st two no. You will find that in all the 3 sets the diff 3 is common so obviously in the 4th set also the diff is 3 so see the no. Which will give 14 by adding 3 so that the diff is 3.
Arul said:
1 decade ago
28 25 5 21 18 5 14 11 5...
28-25 = 3+2 = 5.
21-18 = 3+2 = 5.
14-11 = 3+2 = 5.
So the answer is 11 5.
28-25 = 3+2 = 5.
21-18 = 3+2 = 5.
14-11 = 3+2 = 5.
So the answer is 11 5.
Sagar said:
1 decade ago
28 25 5 21 18 5 14 11 5...
28-7=21.
25-7=18.
5 is common.
21-7=14.
18-7=11.
5 is common.
Than answer is 11 5.
28-7=21.
25-7=18.
5 is common.
21-7=14.
18-7=11.
5 is common.
Than answer is 11 5.
Rama said:
1 decade ago
I had easily understand this logic thank you for giving a simple explanation.
Birendra singh said:
1 decade ago
Now the answer 11, 5 because 28-25 = 3 21-18 = 3 14-3 = 11, 5.
Veeresh said:
1 decade ago
28 25 5 21 18 5 14
28-25 = 3 then
25-21 = 4 then
21-18 = 3 then
18-14 = 4 then
14-11 = 3 then answer is 11
One by one step we can minus by 3 and 4.
Answer: 28 25 5 21 18 5 14 11 5.
28-25 = 3 then
25-21 = 4 then
21-18 = 3 then
18-14 = 4 then
14-11 = 3 then answer is 11
One by one step we can minus by 3 and 4.
Answer: 28 25 5 21 18 5 14 11 5.
AjayKumar said:
1 decade ago
Take first three number as one set. Then take second three number as another set. Here end number these two set is 5. So just leave. Then you have first set as 28 25.
Second set as 21 18.
Here the difference between First number from first set and first number from second set is 7.
Here third set first number is available as 14, then 18-7=11.
Add 5 as last number. Now answer is 14, 11, 5.
Second set as 21 18.
Here the difference between First number from first set and first number from second set is 7.
Here third set first number is available as 14, then 18-7=11.
Add 5 as last number. Now answer is 14, 11, 5.
(1)
Sarbjit said:
1 decade ago
28 (-3) 25 & 5.
21 (-3) 18 & 5.
14 (-3) 11 & 5.
21 (-3) 18 & 5.
14 (-3) 11 & 5.
Rohit vijay said:
1 decade ago
This can be breakdown in a group series of three number:
First series is 28......21.......14 (diff 7).
Second series is 25.....18.......11 (diff 7).
Third series is interpolation of a random number 5...5..5.
So answer is
28,25,5
21,18,5
14,11,5
. . .
First series is 28......21.......14 (diff 7).
Second series is 25.....18.......11 (diff 7).
Third series is interpolation of a random number 5...5..5.
So answer is
28,25,5
21,18,5
14,11,5
. . .
Sandip 5. 4 said:
1 decade ago
Nice logic.
28 25 5 21 18 5 14
28-25=3 then
25-21=4 then
21-18=3 then
18-14=4 then
14-11=3 then answer is 11
One by one step we can minus by 3 and 4
Answer: 28 25 5 21 18 5 14 11 5
28 25 5 21 18 5 14
28-25=3 then
25-21=4 then
21-18=3 then
18-14=4 then
14-11=3 then answer is 11
One by one step we can minus by 3 and 4
Answer: 28 25 5 21 18 5 14 11 5
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