Question
Select the number from the given option that can replace
the question mark (?) in the following series: 19, 35, 71, ?, 235, 379Solution
The logic followed here is the difference between the consecutive numbers from the left end is the squares of consecutive even numbers as shown below. 19 + 4² = 19 + 16 = 35 35 + 6² = 35 + 36 = 71 71 + 8² = 71 + 64 = 135  135 + 10² = 135 + 100 = 235  235 + 12² = 233 + 144 = 379
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