Question 28
Select the number from among the given options that can replace the question mark (?) in the following series.
1, 3, 17, 55, ?, 179, 265, 375
Solution
In the given series, double difference is applicable. As given in the diagram, in the second difference 12, 24, 12, 24 sequences are forming.
(?-55)-38 = 12
? = 55+38+12 =Â 105
Hence 105 will come in place of the question mark.
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