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    Question

    9, 21, 67, 273, 1371,

    ? What should come in place of the question mark (?) in the following number series?
    A 8233 Correct Answer Incorrect Answer
    B 8266 Correct Answer Incorrect Answer
    C 7145 Correct Answer Incorrect Answer
    D 7659 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    9 `xx` 2 + 3 = 21 21 `xx` 3 + 4 = 67 67 `xx` 4 + 5 = 273 273 `xx` 5 + 6 = 1371 1371 `xx` 6 + 7 = 8233

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