Question : Directions: Which number will replace the question mark (?) in the following series?
57, 50, 55, 52, ?
Option 1: 50
Option 2: 53
Option 3: 51
Option 4: 55
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Correct Answer: 53
Solution :
Given:
57, 50, 55, 52, ?
Subtract and add the consecutive odd numbers alternatively (starting from 7) in decreasing order from each term to get the required missing number –
57 – 7 = 50, 50 + 5 = 55, 55 – 3 = 52, 52 + 1 = 53
So, the required missing number in the series is 53. Hence, the second option is correct.
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