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 3 of 13.
Aatif said:
3 years ago
Actually, 5 is common. So 5 remains unchanged in the whole series.
28-3 =25.
25-4= 21.
21-3=18.
18-4=14.
14-3=11.
So the answer is 11 and 5 as common.
11 5.
28-3 =25.
25-4= 21.
21-3=18.
18-4=14.
14-3=11.
So the answer is 11 and 5 as common.
11 5.
(14)
AMAN NAIK said:
3 years ago
@All.
Consider 3 number pairs.
28 25 5 21 18 5 14.
28 - 7 = 21.
25 - 7 = 18.
5.
21 - 7 = 14
18 - 7 = 11
5.
So, 11, 5 in the next number of the series.
Consider 3 number pairs.
28 25 5 21 18 5 14.
28 - 7 = 21.
25 - 7 = 18.
5.
21 - 7 = 14
18 - 7 = 11
5.
So, 11, 5 in the next number of the series.
(88)
Hitu said:
6 years ago
This question was very simple.
See, 28 25 5 21 18 5 14.
28-25=3.
5 was common in every 3 no.
Then 21-18=3.
5 common.
14-3=ans 11.
And 5 common.
See, 28 25 5 21 18 5 14.
28-25=3.
5 was common in every 3 no.
Then 21-18=3.
5 common.
14-3=ans 11.
And 5 common.
Vaidik said:
9 months ago
@All.
Here, the First number will be 11 and the second number will be 7, need to check the options once again.
Correct me, If I am wrong.
Here, the First number will be 11 and the second number will be 7, need to check the options once again.
Correct me, If I am wrong.
(4)
Hema said:
2 years ago
diff(28 - 25) = 3,
5
diff(21-18) = 3,
5,
diff(14-x) = 3.
Then, 14-3=x=>x=11.
5
Hence 28 25 5 21 18 5 14 11 5 is the correct order.
5
diff(21-18) = 3,
5,
diff(14-x) = 3.
Then, 14-3=x=>x=11.
5
Hence 28 25 5 21 18 5 14 11 5 is the correct order.
(124)
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........
Sai vamshi said:
1 decade ago
28 25 5 21 18 5 14
Count 3 numbers
28-21 = 7
21-14 = 7
And 25-18 = 7
18-? = 7/11
And 5 is came on
Next element is 5
Ans: 11 5.
Count 3 numbers
28-21 = 7
21-14 = 7
And 25-18 = 7
18-? = 7/11
And 5 is came on
Next element is 5
Ans: 11 5.
Trilok Tak said:
10 years ago
28 25 5 21 18 5 14 ? ?
28 (-3) = 25 (Repeat)5.
21 (-3) = 18 (Repeat)5.
14 (-3) =11 (Repeat)5.
So,
28 25 5 21 18 5 14 11 5.
28 (-3) = 25 (Repeat)5.
21 (-3) = 18 (Repeat)5.
14 (-3) =11 (Repeat)5.
So,
28 25 5 21 18 5 14 11 5.
K.chandra babu said:
9 years ago
5 is here just to confuse us .
Subtracting 3 from alternative numbers that is;
28 - 25 = 3.
21 - 18 = 3.
14 - 11 = 3.
Subtracting 3 from alternative numbers that is;
28 - 25 = 3.
21 - 18 = 3.
14 - 11 = 3.
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.
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