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.
13, 40, 122, 369, ___
Option 1: 1110
Option 2: 1111
Option 3: 1112
Option 4: 1113
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Correct Answer: 1111
Solution :
Given:
13, 40, 122, 369, ___
Multiply each number by 3 and add the consecutive number to the resultant to get the missing term –
(13 × 3) + 1 = 39 + 1 = 40;
(40 × 3) + 2 = 120 + 2 = 122;
(122 × 3) + 3 = 366 + 3 = 369;
(369 × 3) + 4 = 1107 + 4 = 1111
So, the missing number is 1111. Hence, the second option is correct.
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