Question
Select the number from the given option that can
replace the question mark (?) in the following series: 9, 57, 120, ?, 299, 419Solution
The logic followed here is as follows: 9 + (7² − 1) = 9 + 48 = 57 57 + (8² − 1) = 57 + 63 = 120 120 + (9² − 1) = 120 + 80 = 200 200 + (10² − 1) = 200 + 99 = 299 299 + (11² − 1) = 299 + 120 = 419
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