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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