Question : Directions: In the following question a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
1, 3, 7, 13, 21, 31, 43, ?
Option 1: 55
Option 2: 57
Option 3: 59
Option 4: 61
Correct Answer: 57
Solution :
Given:
1, 3, 7, 13, 21, 31, 43, ?
In the above-given series, add the multiples of 2 to the previous term to get the next term –
1 + 2 = 3; 3 + 4 = 7; 7 + 6 = 13; 13 + 8 = 21; 21 + 10 = 31; 31 + 12 = 43; 43 + 14 = 57
So, 57 is the missing term of the series. Hence, the second option is correct.
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