Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series.
6, 9, 7, 10, 8, 11, ?
Option 1: 12
Option 2: 9
Option 3: 11
Option 4: 10
Correct Answer: 9
Solution :
Given:
6, 9, 7, 10, 8, 11, ?
Every alternate number in the series is a consecutive natural number as shown below –
(I)
6
, 9,
7
, 10,
8
, 11,
?
→6 + 1 = 7; 7 + 1 = 8; 8 + 1 = 9
(II) 6,
9
, 7,
10
, 8,
11
, ?→9 + 1 = 10; 10 + 1 = 11
So, 9 is the missing number of the series. Hence, the second option is correct.
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