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.
121, 253, 374, 495, ?
Option 1: 565
Option 2: 523
Option 3: 616
Option 4: 5102
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Correct Answer: 616
Solution :
Given
:
121, 253, 374, 495, ?
Multiply the first term of the series by consecutive natural numbers starting from 2 and add 11 to the resultant to get the next term.
(121 × 2) + 11 = 242 + 11 = 253;
(121 × 3) + 11 = 363 + 11 = 374;
(121 × 4) + 11 = 484 + 11 = 495;
(121 × 5) + 11 = 605 + 11 = 616
So, the missing number is 616. Hence, the third option is correct.
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