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.
5, 10, 13, 26, 29, 58, 61, ?
Option 1: 122
Option 2: 125
Option 3: 128
Option 4: 64
Correct Answer: 122
Solution :
Given:
5, 10, 13, 26, 29, 58, 61, ?
Multiply by 2 and add 3 alternatively to the numbers of the series to find the next term –
5 × 2 = 10; 10 + 3 = 13; 13 × 2 = 26; 26 + 3 = 29; 29 × 2 = 58; 58 + 3 = 61; 61 × 2 = 122
So, the missing number of the series is 122. Hence, the first option is correct.
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