Question : Directions: Which of the following numbers will replace the question mark (?) in the given series?
15, ?, 27, 39, 55, 75
Option 1: 19
Option 2: 20
Option 3: 21
Option 4: 18
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Correct Answer: 19
Solution :
Given:
15, ?, 27, 39, 55, 75
In the above-given series, add the multiples of 4 to the previous number to obtain the next number.
15 + 4 = 19; 19 + 8 = 27; 27 + 12 = 39; 39 + 16 = 55; 55 + 20 = 75
So, 19 is the missing number of the series. Hence, the first option is correct.
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