Question : Directions: What should come in place of the question mark (?) in the given series?
57, 43, 31, 21, 13, (?)
Option 1: 5
Option 2: 6
Option 3: 9
Option 4: 7
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Correct Answer: 7
Solution :
Given:
57, 43, 31, 21, 13, (?)
Subtract consecutive even numbers starting from 14 in decreasing order to get the missing term –
57 – 14 = 43; 43 – 12 = 31; 31 – 10 = 21; 21 – 8 = 13; 13 – 6 = 7
So, 7 is the missing term in the series. Hence, the fourth option is correct.
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