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.
4, ?, 19, 39, 79, 159
Option 1: 10
Option 2: 8
Option 3: 12
Option 4: 9
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Correct Answer: 9
Solution :
Given:
4, ?, 19, 39, 79, 159
The pattern followed here is –
4 + (5 × 1) = 4 + 5 = 9
9 + (5 × 2) = 9 + 10 = 19
19 + (5 × 4) = 19 + 20 = 39
39 + (5 × 8) = 39 + 40 = 79
79 + (5 × 16) = 79 + 80 = 159
So, 9 is the missing term of the series. Hence, the fourth option is correct.
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