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    Question

    156, 237, 286, 311, 320,

    ? What will come in place of the question mark (?) in the following series?
    A 380 Correct Answer Incorrect Answer
    B 321 Correct Answer Incorrect Answer
    C 355 Correct Answer Incorrect Answer
    D 305 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, 156 + 92 = 237 237 + 72 = 286 286 + 52 = 311 311 + 32 = 320 320 + 12 = 321 The given series follows the following pattern: (Number + square of odd numbers in decreasing order starting from 9)

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