Question
A series is given with one term missing. Choose the
correct alternative from the given ones that will complete the series. 55, 59, 68, 84, ___, 145Solution
The logic followed here is: Each subsequent number is obtained by adding the square of consecutive natural numbers starting from 2. 55 + 2² = 55 + 4 = 59 59 + 3² = 59 + 9 = 68 68 + 4² = 68 + 16 = 84 84 + 5² = 84 + 25 = 109 109 + 6² = 109 + 36 = 145 So, '109' will complete the series.
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