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, 21, 57, ?, 221
Option 1: 96
Option 2: 108
Option 3: 121
Option 4: 126
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Correct Answer: 121
Solution : Given: 1, 5, 21, 57, ?, 221
Add the square of the consecutive even numbers to the previous term to obtain the next term. 1 + 2 2 = 5, 5 + 4 2 = 21, 21 + 6 2 = 57, 57 + 8 2 = 121, 121 + 10 2 = 221
So, 121 is the missing term in the given series. Hence, the third option is correct.
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