Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? 27, 38, ?, 68, 87, 110
Option 1: 47
Option 2: 50
Option 3: 51
Option 4: 53
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Correct Answer: 51
Solution : Given: 27, 38, ?, 68, 87, 110
Add consecutive prime numbers (starting from 11) to each number in the given series to get the next number of the series. 27 + 11 = 38; 38 + 13 = 51; 51 + 17 = 68; 68 + 19 = 87; 87 + 23 = 110
So, 51 is the missing number. Hence, the third option is correct.
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