Question

    Select the number from among the given options that can replace the question mark (?) in the following series.

    19, 38, 114, 570, ?, 43890

    A 3090 Correct Answer Incorrect Answer
    B 3990 Correct Answer Incorrect Answer
    C 4090 Correct Answer Incorrect Answer
    D 4990 Correct Answer Incorrect Answer

    Solution

    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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