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:
126 comments Page 6 of 13.
Balvir said:
1 decade ago
28 (-3) 25 & 5
21 (-3) 18 & 5
14 (-3) 11 & 5
Ans (A) 11 5
21 (-3) 18 & 5
14 (-3) 11 & 5
Ans (A) 11 5
Archana 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
Omkar said:
1 decade ago
That is quite simple.
INTERPOLATION here means simply including the number without logic.
28 25 5 21 18 5 14
Here 5 is used as a median you can say remove the 5's
28 25 (diff 3)
21 18 (diff 3)
14 ? (diff 3)( ?=11)
Then the next number is 5 because of interpolation.
28 (-3) 25 & 5
21 (-3) 18 & 5
14 (-3) 11 & 5
Ans (A) 11 5
INTERPOLATION here means simply including the number without logic.
28 25 5 21 18 5 14
Here 5 is used as a median you can say remove the 5's
28 25 (diff 3)
21 18 (diff 3)
14 ? (diff 3)( ?=11)
Then the next number is 5 because of interpolation.
28 (-3) 25 & 5
21 (-3) 18 & 5
14 (-3) 11 & 5
Ans (A) 11 5
Kailash malav said:
1 decade ago
Simply , look series first two number difference is 3 and second digit less than first digit than third digit is 5 and so on........
Rashmi Kumari said:
1 decade ago
Difference of 1st and 4th number in series as 7,7,0 so put the value like that. So the next number in series are 11,5
28-21=7(1st no-4th no)
25-18=7(1st no-4th no)
5-5=0(1st no-4th no)
21-14=7(1st no-4th no)
18-11=7(1st no-4th no)
5-5=0(1st no-4th no)
28-21=7(1st no-4th no)
25-18=7(1st no-4th no)
5-5=0(1st no-4th no)
21-14=7(1st no-4th no)
18-11=7(1st no-4th no)
5-5=0(1st no-4th no)
Lovely said:
1 decade ago
28-3=25 then 5
21-3=18 then 5
14-3=11 then 5
so answer is 11 5..
21-3=18 then 5
14-3=11 then 5
so answer is 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
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
. . .
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.
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.
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