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, ?
Option 1: 27
Option 2: 29
Option 3: 31
Option 4: 33
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Correct Answer: 31
Solution : Given: 1, 3, 7, 13, 21, ?
Add consecutive even numbers in the previous term to obtain the next term. 1 + 2 = 3; 3 + 4 = 7; 7 + 6 = 13; 13 + 8 = 21; 21 + 10 = 31
So, 31 is the missing number in the given series. Hence, the third option is correct.
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