Question
Select the number from among the given options that can
replace the question mark (?) in the following series. 19, 38, 114, 570, ?, 43890Solution
The pattern followed here is: 19 (x 2) 38 (x 3) - 114 (x 5) - 570 (x 7) - 3990 - 3990 (x 11) - 43890 The pattern is: Each subsequent number is multiplied by the immediate prime number (starting with 2). Thus, the missing number is 3990. Hence, the correct answer is (B).
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