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.
?, 9, 19, 39, 79
Option 1: 4
Option 2: 7
Option 3: 6
Option 4: 9
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Correct Answer: 4
Solution :
Given:
?, 9, 19, 39, 79
The pattern followed here is –
79 – 39 = 40→40 ÷ 2 = 20
39 – 19 = 20→20 ÷ 2 = 10
19 – 9 = 10→10 ÷ 2 = 5
Now, subtract 5 from 9 to get the missing number –
9 – 5 = 4
Hence, the first option is correct.
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