Question : Directions: In the following question a series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series.
1, 5, 2, 6, 3, 7, ?
Option 1: 6
Option 2: 5
Option 3: 4
Option 4: 3
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Correct Answer: 4
Solution :
Given:
1, 5, 2, 6, 3, 7, ?
The series is a combination of two series (1, 2, 3, ...) and (5, 6, 7, ...)
The common difference between the first and second series is 1.
1
, 5,
2
, 6,
3
, 7,
?
→1 + 1 = 2; 2 + 1 = 3; 3 + 1 = 4
1,
5
, 2,
6
, 3,
7
, ?→5 + 1 = 6; 6 + 1 = 7
So, the missing number is 4. Hence, the third option is correct.
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