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 11 of 13.
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........
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
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
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
Richa said:
1 decade ago
Thanks rohit to give us explanation.
Akhila said:
1 decade ago
Nice solution rohit.
MAHESH said:
1 decade ago
28-3=25 the answer is 3 after the number is 5 next substact the 21 and 18 the answer is 3 the randomly 5 is comes again we substaract 14-3=11 randomly the 5 comes the answer is A.
Sanchit said:
1 decade ago
Thanks rohit.
Ganesh said:
1 decade ago
Super Rohit.
Shankari said:
1 decade ago
I can't understand this problem.
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