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    Question

    What should come in place of the question mark (?) in the following number series?

    7       15        31      

    63       127       ?
    A 250 Correct Answer Incorrect Answer
    B 229 Correct Answer Incorrect Answer
    C 255 Correct Answer Incorrect Answer
    D 262 Correct Answer Incorrect Answer
    E 244 Correct Answer Incorrect Answer

    Solution

    7 × 2 + 1 = 15 15 × 2 + 1 = 31 31 × 2 + 1 = 63 63 × 2 + 1 = 127 127 × 2 + 1 =  255

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