Question
Identify the number that does NOT belong to the
following series. 3, 7, 12, 21, 57, 109, 276, 499Solution
Seies = 3, 7, 12, 21, 57, 109, 276, 499 Logic : the series is based on double difference Pattern: First difference is cube of numbers and it is in alternate places Second difference is of square of the numbers and it is in alternate places as well. Series of difference = 4, 5, 9, 36, 52, 167 , 223. Series of double difference = 1, 4, 27, 16, 115 , 56. Instead of 115, 125 will be placed. Â
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