Question : Directions: Select the number that will replace the question marks (?) in the following series.
28, ?, ?, 69, 88, 111, 140, 171
Option 1: 39, 52
Option 2: 38, 50
Option 3: 29, 52
Option 4: 39, 59
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Correct Answer: 39, 52
Solution :
Given:
28, ?, ?, 69, 88, 111, 140, 171
Add the consecutive prime numbers starting from 11 to the previous term to obtain the next term.
28 + 11 = 39; 39 + 13 = 52; 52 + 17 = 69; 69 + 19 = 88; 88 + 23 = 111; 111 + 29 = 140; 140 + 31 = 171
So, 39 and 52 are the missing terms in the given series. Hence, the first option is correct.
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