Question : Directions: Which of the following numbers will replace the question mark (?) in the given series?
3, 12, ?, 39, 57, 78
Option 1: 19
Option 2: 22
Option 3: 20
Option 4: 24
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Correct Answer: 24
Solution :
Given:
3, 12, ?, 39, 57, 78
In the above-given series, add the multiples of 3, starting from 9 to the previous number to obtain the next number.
3 + 9 = 12; 12 + 12 = 24; 24 + 15 = 39; 39 + 18 = 57; 57 + 21 = 78
So, 24 is the missing number of the series. Hence, the fourth option is correct.
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