Question : Directions: In the following question a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
3, 15, 4, 16, 5, 17, 6, ?, 7
Option 1: 12
Option 2: 13
Option 3: 15
Option 4: 18
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Correct Answer: 18
Solution :
Given
:
3, 15, 4, 16, 5, 17, 6, ?, 7
The series can be divided into 2 separate series of odd-placed and even-placed digits. In both series, a common pattern of increasing the numbers by 1 is followed.
Odd place digits are→3, 4, 5, 6, 7
3 + 1 = 4; 4 + 1 = 5; 5 + 1 = 6; 6 + 1 = 7
Even place digits are→15, 16, 17, ?
15 + 1 = 16; 16 + 1 = 17; 17 + 1 = 18
So, the missing number is 18. Hence, the fourth option is correct.
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