Question : Directions: Which of the following numbers will replace the question mark (?) in the given series?
5, 7, 11, 13, 17, 19, 23, 25, ?
Option 1: 39
Option 2: 56
Option 3: 42
Option 4: 29
Correct Answer: 29
Solution :
Given:
5, 7, 11, 13, 17, 19, 23, 25, ?
In the above-given series, add 2 and 4 alternatively to the previous number to obtain the next number.
5 + 2 = 7, 7 + 4 = 11, 11 + 2 = 13, 13 + 4 = 17, 17 + 2 = 19, 19 + 4 = 23, 23 + 2 = 25, 25 + 4 = 29
So, 29 is the missing number of the series. Hence, the fourth option is correct.
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