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, 5, 13, 25, 41, 61, ?
Option 1: 85
Option 2: 77
Option 3: 81
Option 4: 91
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Correct Answer: 85
Solution : Given: 1, 5, 13, 25, 41, 61,?
In the given series, add the multiples of 4 to the previous term to obtain the next term. 1 + 4 = 5; 5 + 8 = 13; 13 + 12 = 25; 25 + 16 = 41; 41 + 20 = 61; 61 + 24 = 85
So, 85 is the required number in the given series. Hence, the first option is correct.
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